Buttons that don't look like buttons but more like static text are a "modern" and irritating trend, but a while ago I had to use a web application which somehow managed to show all 4 combinations of "button-ness": it had buttons which looked like buttons, buttons which didn't look like buttons but static text, static text which looked like static text, and most WTF-inducing, static text which looked like buttons.

It really boggles the mind to wonder who/what decided on that, since making non-clickable text look like buttons --- complete with text that was also suitably ambiguous, e.g. "Remove" --- is something that I've never seen a rationale for.

The irony is, while it could be argued that you can mouse over controls in a web app to see whether they're clickable, this flat UI trend came from touchscreen mobile devices where "mouse over" just isn't a thing!

I get the rationale behind much of what followed by every time I have to use Windows 7 I wonder what the hell they where thinking, I don't dislike Win10 (from a UI perspective) quite as much.

Cinnamon/GTK (Mint-X-Sand) is still much clearer for me than Win10 though.