I think Teams integration is more of an acknowledgement that video-calling and workplace collaboration is a default usecase for desktop computing (like email, calendar, calculator, text editing).

>They are making claims about it being more performant, but that's hard to imagine when considering their promises for backwards compatibility.

I can run Windows 95 programs on Windows 10, not sure where the knock is coming from on backwards compatibility.

>Here comes another UI overhaul instead of simply fixing the trash menus

From the leaked ISO, the menus are much improved and overhauled. Sure, I want a modern tabbed File Explorer too, but it's clearly being worked on.