Today when cropping an image in Preview.app on Tahoe I ran into an issue where you can't use the bottom of the crop selection rectangle because the rounded corner of the window blocks it.
Pinch (or CMD + minus) zoom out slightly as a workaround.
I'm one of the people who actually mostly likes Tahoe. Funny to see how new versions of MacOS always get piled on, in such a groupthink manner.
For me personally, once in used to the new UI, going back seems crude.