No. I think it's just the idiotic notion that as soon as a new version of something is introduced, all the versions that came before are suddenly worthless garbage.

Here is a non-photographic example. In May of 2019, I bought a new vehicle made by an American manufacturer. Of course, my inbox was immediately flooded with emails from them about all sorts of things. The goal was to make sure I felt good about spending all that money. Before long, the tone of those emails shifted to trying to convince me to "trade up" to the "redesigned" 2020 version of the same model in order to experience all the advantages it offers. Are there improvements? Possibly, although none that are obvious to me. What is true is that the 2020 model is significantly smaller. This is a big deal, because the 2019 is just barely big enough.

So as far as I can tell, the only ones who would benefit if I did trade would be the manufacturer and the dealer. Not interested.

Cameras are exactly the same. There are probably some photographers who would benefit from the switch. There are probably more who have the illusion that they would benefit. My own sense of reality tells me I am fine staying where I am and either hanging on to my money or using it for something else.

Let's face it. Most "photographers" need a lot more than a new camera to improve. Personally, I need vision that is not declining because of glaucoma. Some on this site need expanded imagination. Some need a better realization of what might be interesting to others. Some need a better understanding of basic principles. Some do need a camera that is easier to use and to apply those fundamentals. Very few really have a specific need to get rid of a mirror.

Live view is a term usually used when the rear screen is used for viewing. Mirrorless is a term used for mirrorless camera's. I am sure you are referring to mirrorless camera's?
I currently own both DSLR's and mirrorless camera's, the biggest advantages of mirrorless are that I can see exactly what the exposure is going to be BEFORE I trip the shutter, I no longer need to FINE TURN any lens, and I can shoot at 20 frames a second and soon 30 frames per second.
As far as image quality goes, yes, you can get outstanding image quality from either. Though image quality is more a function of the photographer than the camera.

Actually, you don’t see the image formed by the lens. You only see a reflection of what is in front of your camera. Your image can be wildly over or underexposed and not know it until you make the shot. I don’t like the image in my mirrorless viewfinder either but I love seeing the exact exposure I’m going to get.
This entire topic strikes me as strange. An awful lot of photographers justifying their decision to stay with what I consider obsolete technology. Virtually everything about my mirrorless camera is a step up in technology. Some of it an unfathomable improvement. Hanging on to DSLR is, in my opinion, like the railroad companies hanging on to the steam engine when the diesel locomotives came out. I collect old cameras and love them. So far, they are all mechanical film cameras. When digital SLRs get cheap enough, they will get added to my collection. For now, I have sold both of my awesome Canon’s and have no interest in looking back.