Oh... except for their lack of a title bar, which prevents you from telling which application you're looking at. Is this PDF open in Edge, or Acrobat? Who knows. The windows look the same.
Beyond that... it's a disgraceful mess. You have applications now with no menu bar, but instead a bunch of hamburger buttons and "gear" buttons scattered all over the place. And common, standard functions like "save file" are further hidden behind "more" labels even in THOSE menus.
Another example of Windows's galling regression: the abolition of the File dialog in many apps, which have replaced it with a giant page of crudely-drawn, unlabeled, super-wide text boxes and a bunch of plain text. There's no file structure shown, so you have no idea where you are about to save a file... It's truly a clinic on dogshit UI. Pathetic.