> flat UI is super easy. Skeuomorphic is extremely hard to get right

What I don't understand is why those are treated as the only two choices?

Just adding some shadows, dividers, 3D buttons and real scroll bars again would go a long way to making things more usable without going full on into skeuomorphism to represent elements of the physical world.

A good example of the wrong direction was macOS in the switch to Tahoe. Buttons in modal dialog boxes became flat instead of 3D. They no longer look like buttons, they just look like a web-UI card with a gray background. There is no visual indicator at all that it is a clickable button.

Why? Legitimately, I want to hear from the designer(s) that made that decision and what their reasoning was.