Having been a photographer of serious bent since 1968 in middle school, I concur wholeheartedly. Mirrorless digital is HUGE progress. Looking back 50+ years, we had great film cameras back in the day. But technology has moved forward at an ever accelerating rate, and now we have tools we never dreamed of back then.

The good news is that we have choices.

There is still a wide array of films available, but they ARE expensive. Fortunately, digital means of scanning or copying film can extend the usefulness and the precision of post-processing and printing film images.

We have a very wide array of digital camera devices... from smart phones, to point-and-shoot cameras, to travel zoom cameras, to dSLRs and MILCs. There is something for everyone. Most of it is good, and I'd venture to say, most of it is better than most of the small format film gear we used to use!

I still hold onto my Nikon FTn and F3HP, my Canon A1, my Bronica ETRSi, and all my darkroom gear from my youth. But no rational reasoning applies there. I don't use it. I won't use it. I just like to look at it. My wife gets p*ssed off about that! But she still has her Minolta SRT-100 and a couple of lenses...

I left my dSLR gear and dedicated camcorder gear behind when I semi-retired in 2012. I never wanted two separate camera systems then, and still don't. So I chose Lumix GH series cameras, and haven't looked back. And no, I don't do landscape or sports or birds in flight or safari photography with it. I have no interest in that. But for the training videos and stills work I do, and my hobby filmmaking with my twins, my choice makes sense. It will evolve over time, but for now, it's enough. One twin has a GH5, and the other has a GH4, and we share the same pool of Lumix lenses and adapted SLR lenses.

Like you, HELL YES, I would do it again. I'd do it exactly the same way. Is my gear perfect? No. NO camera is perfect. There is only the perfect camera for what I'm doing RIGHT NOW. Sometimes, that is whatever camera I have, and often, that is an iPhone 7 Plus. For a huge amount of casual photography, it is good enough. But for serious, "intentional" photography, where I need to be precise in capturing an image or a documentary interview or training process, I'll pull out the GH4 or my kid's GH5.

I have no dispute at all with the positives about mirrorless that Paul (Chg_Canon) and others have responded.

You might also want to consider some of the negatives aspects of mirrorless...

- Generally speaking, less shots per battery charge. This is largely due to the heavy power requirements of electronic viewfinders. The optical viewfinder in a DSLR is usable any time, even when the camera is powered down. Those OVFs also use relatively little power when active. This is not the case with mirrorless that rely upon an EVF (as most do). It's completely dark when the power is off and drawing power constantly when in use. All those cool, gee-whiz features in the EVF also need power. Now, most people get a lot more shots than CIPA tests would suggest, but the same is true of DSLRs. Just be sure to check the rating of any camera you consider and compare.

- Also related to the viewfinder, some mirrorless have an issue with blackout when shooting bursts. Most manufacturers have worked to address this with some success, at least in their more advanced (and more expensive) models.

- Most mirrorless top frame rates are only possible with electronic shutter (which is also the "silent" shutter). A possible problem with electronic shutter is "rolling shutter effect". This is where moving subjects are noticeably distorted in the image. The faster the movement, the stronger the distortion. It happens regardless of shutter speed and can be caused too if the camera is moving (such as panning or shooting from a moving vehicle). It also can cause "banding" issues under some types of lighting. Some manufacturers have produced cameras using backlit sensors that give a much faster readout of the data being captured, to minimize rolling shutter effect. But this type of sensor is generally only found in more advanced (and more expensive) models. Of course an alternative is to use the camera's mechanical shutter instead... but then you won't get the super fast frame rates. Still, the mechanical shutter is an option on most mirrorless, though since the upcoming top-of-the-line Nikon Z9 will be electronic shutter only, we may start seeing mechanical shutters going away.

- Not all electronic shutters are compatible with flash. Some recent (and more expensive) cameras have addressed this problem.

- Cost might be a consideration. In some cases the camera or lens might be cheaper than a comparable DSLR and it's lens. But in many cases the mirrorless gear is more expensive.

- Availability of native lenses and accessories may be limited. At their peak, the Nikon and Canon universe for their DSLRs included roughly 100 lenses. They've also been selling them for 30 or more years, so there is a crap load of used lenses. It's similar with some accessories. While it may be possible to adapt DSLR lenses for use on a mirrorless camera, in some cases autofocus performance takes a hit... plus the combination of the lens, adapter and camera may end up weighing roughly the same as a DSLR with the lens and no adapter. There also may not be much savings in size. Currently Sony, Fuji and the Olympus/Panasonic (micro 4/3 format) systems each offer between 35 and 45 lenses to choose among. What's lacking are mostly specialized lenses, such as macro and tilt/shift (aka perspective control). Since the Canon RF-mount and Nikon Z-mount mirrorless systems are relatively new... approx. 3 years old... they have less native lenses so far, although they're rapidly adding them. Each currently have approx. 24 lenses. The Nikon Z-series lenses, in particular, don't cover a lot of range yet. So depending upon what you need and the system you choose, maybe they'll have what you need... or maybe they won't. There are almost no used lenses available yet for some of these systems, too.

- There are very limited third party lens selection for many of these manufacturers, too. Almost none for Canon and Nikon. Not many for Fuji or Oly/Panasonic either. Sony sees pretty good support from 3rd party manufacturers for their E-mount system, but it's nowhere near as many options as there are for the Canon and Nikon DSLR systems.

- Pentax, Canon and Nikon DSLR systems all offer option of full frame or APS-C crop sensor format (note: Pentax has committed to DSLR only, no mirrorless). Each manufacturers have multiple models in each format and, without going into detail here, each format has its strengths and weaknesses. Right now among mirrorless, only Sony offers a reasonably good choice of full frame and APS-C models (though one of their new APS-C models has been indefinitely delayed due to chip shortages). Nikon offers both full frame and ASPS-C, but really only one example of the latter (there are two models in different styles, but functionally the same). Fuji is APS-C only (although they also make medium format mirrorless). Olympus/Panasonic are micro 4/3 only. The "L-mount alliance" of Sigma, Panasonic and Leica is so far full frame only. So is Canon's R-series (although they have a separate, largely non-interchangeable APS-C EOS-M system that they treat like an ugly step-child).

- Mirrorless camera tech is advancing rapidly. Manufacturers are sinking a lot into R&D for mirrorless (sometimes to the neglect of their other systems), some of which is in an effort to solve some of the problems noted above. This is good... But it also may mean that some (many?) models have or will become obsolete quickly, rapidly losing value while encouraging frequent upgrades. This is a bit like when the whole digital revolution hit hard 20 or 25 years ago to rapidly replace film. Significant tech breakthroughs were coming fast and furious, sometimes making cameras obsolete shortly after they arrived in stores! That was finally slowing down the last five or ten years... only to see the upswing of mirrorless replacing DSLRs. Over the course of 10 or 11 years (1998 to 2009), I went from 1.5MP to 6MP to 8MP to 15MP (plus 21MP in another format) to 18MP cameras.... And have since bought two more generations, each with a little more MP! Heck, I even skipped several generations along the way! (3MP, 10MP, 12MP, etc.) We're seeing something similar now in mirrorless!

None of the above are "deal breakers". Each "problem" noted may have no importance to you and/or is being worked on and dealt with by the manufacturers. And certainly, as we've seen in other responses mirrorless has a lot of pluses. In fact, recent mirrorless systems are fully capable of meeting most people's needs. But there are some things you may need to consider... Things that may affect your choices whether or not now is the time to go mirrorless. Or, if you do make the switch now, which mirrorless system would be best for you.