Tahoe’s Windows
The windows on MacOS 26 Tahoe don’t really have comically large, childish corner radiuses. They just look like they do because some jackasses at Apple — all of whom, I pray, are now at Meta — thought they looked better that way. It’s a straight-up inversion of Steve Jobs’s maxim that design is about how things work, not how they look. I can think of no better example to prove that the new UI in MacOS 26 Tahoe was designed by people who do not understand or care about the most basic fundamental principles of good design.
In general I think the larger corner radiuses of windows in macOS Tahoe look fine. But if Apple really wanted to make this new look functional they really needed to rethink how windows work at a more fundamental level. The window’s corners should not be clipping the scroll bar. The resize target needs to be increased. Toolbar items should feel like they naturally fit in a window’s corner.
What Apple shipped is how I expect an overly-ambitious Linux theme to work within the constraints of X11 — not macOS.