I realize this is mostly subjective, but I don't like anything about the UI. I haven't spent much time on it yet, but a few things stand out already. 1) I miss launchpad. I had all my apps arranged the way I wanted them with the first page being Apple native apps, and the second sorted by priority used. The new version forces me to scroll or use finder. 2) I had the widgets I wanted set up in notifications in a hot corner at the top right. By default, widgets are now on the desktop. Yes, I was able to change this back, but why should I have to? 3) When using Apple Music, the song title, Airplay icon and volume slider were at the top. Now to adjust volume you have to click on the speaker icon, then adjust it. Just an extra click but again, why? 4) Transparency, to me, serves no purpose. I ended up reducing it in Accessibility. Seems like change for change's sake. 5) And the round corners on everything. Why?
I'm generally a pretty staunch Apple supporter, but it seems like Tahoe (and don't even get me started on iOS 26) are just changes because they couldn't think of anything better to do. Very disappointed.