made necessary because there's a lack of user options for picking ui colors like you used to be able to; and the ones microsoft uses for selected items are horrible, with very little contrast to distinguish them from background colors.
I actually prefer it because file explorer on windows servers is hard to see the edge of as I get older.
There does need to be some clear contrast for a window so you can visually identify where it is.
So if they could do this with non maximized “normal” windows that would be handy. But I get why they’re doing it with light background, light highlight color, etc.