I had that turned off years ago (for reasons I don't remember), and was wondering what all the fuzz was about when 26 came out because I didn't see much of a difference ;)
IMHO the actual important visual changes in the 27 beta is that rolls back the bizarre oversized corner radius in Finder windows, and they also got rid of the 'every menu item must have an icon' idea.
Having installed the beta, I think that's the best you can say about it.
Nothing will ever be as good as 25.
Because macOS 25 does not exist. ;-)
iOS 26 anecdote:
A couple of weeks ago, I had a Baltimore Oriole (a cool-looking bird, not a baseball player) in my yard. They aren't rare, per se, but they are uncommon.
Took my iPhone out to snap a picture, and pressed the camera button. I hadn't used it, since upgrading to 26.
It takes the picture. It's there. I can see it, but it won't let me save it. Instead, it wants to tell me about the cool new voice-activated AI retouch feature. There was no way to save.
I probably could have figured it out, but I was so furious, I just nuked the picture.
For those of us older than just 10 years of using macOS, the older Apple OSes have instilled within us the desire to never install the X.0 release and wait until at least the X.1 release. The bug-free experience is a myth
I think that applies to almost all software, not just Apple OSes. After all, Confucius said: "The only thing worse than old software is new software."