Well is relative...

For many photographers, simply knowing that one camera is better than another is 4/5ths the battle.
Most viewers really don't care with what camera an image was taken. Unless they are equipment worshipers or pixel peepers. And, unless they have something with which to compare, the viewer would have no idea if another camera would be "better". (Then there is post processing abilities...)
It's all in the mind of the photographer.
What is necessary to make him feel good about his work.

With so many people posting the question of whether it's worth it to buy into a new camera system, I thought I'd add my two cents worth on how I arrived at my own decision. I have gone kicking and screaming into all new technology, and DSLR to mirrorless is no exception. I have loved my D750's and been very happy with the handling and image output. BUT, my photography is limited to trips once or twice a year by plane into areas where blowing sand seems to be the norm...so, no changing lenses in the field for me! As a result, I have traveled with two camera/lens combos for years. Age has caught up with me and I just can't handle the weight (or bulk) of carrying a lot of gear through the airports anymore. Remembering how much fun travel with the D5300 (APS-C) and the popular 18-200mm lens was years ago, Nikon's Z24-200mm lens got stuck on my radar as a possible solution to a lighter travel option. Having gotten spoiled to full-frame, I decided the Z5 (well suited for landscape photography) with that lens was worth the headache of learning the new menu and operation, and I bit the bullet. For me, staying with a familiar Brand and researching performance reviews of the equipment until I found what satisfies my shooting style, has produced a package that weighs less than half what I had been carrying and takes up a third of the space in my carry-on at the airport, and, with IBIS plus VR, requires less need of the tripod. Plus, I won't set off on foot, only to realize I have the wrong focal length lens with me and have to return to the car to change out my combo. (I did also purchase the FTZii lens adapter, though, in order to still have access to my primes for special events like shooting the Milky Way, etc.) But the icing on the cake, is that I discovered I could get surprisingly good (printable) images from my Galaxy S24+, so now I am all set to travel light for my next photography trip and be ready to grab whatever pops into view. Now, if the weather just cooperates, lol!

Well is relative...

For many photographers, simply knowing that one camera is better than another is 4/5ths the battle.
Most viewers really don't care with what camera an image was taken. Unless they are equipment worshipers or pixel peepers. And, unless they have something with which to compare, the viewer would have no idea if another camera would be "better". (Then there is post processing abilities...)
It's all in the mind of the photographer.
What is necessary to make him feel good about his work.

I find that mirrorless camera's put me at a greater advantage in wildlife photography than any DSLR could.
30 frames per second RAW could never be obtained with a DSLR, Eye focus is not available on a DSLR, I can set my camera so that I can see what the exposure looks like before I take the shot, not available on a DSLR, I can shoot in silent mode on my Sony mirrorless, my DSLR D850 let everyone within a 100 yards of me know when I took an image, especially the wildlife.
For me as a wildlife photographer, mirrorless beats DSLR's hands down, no contest, book um Danno.