The really bright color should only be on the app who has focus I think, the other one could be dimmed when not on focus.
On Mobile you see only one app at a time so it's fine, but it would be tiring quick to have all these bright colors everywhere, plus when you get back to your desktop you would have no idea on which app you are.
Good point. It's important to properly highlight the focused window on desktop so that it's clear where keyboard input goes, and in the screenshots it doesn't look like they do that. I hope the final product fixes that.
On Mobile you see only one app at a time so it's fine, but it would be tiring quick to have all these bright colors everywhere, plus when you get back to your desktop you would have no idea on which app you are.