I think the Microsoft Store actually did not require the account, which is quite a unique feature across app stores. Whether that is actually relevant on an OS that now forces online accounts in other ways is questionable.
Yes, quite a bit. Not so much as a replacement for trackpad/keyboard/mouse, but mostly to write down notes with a stylus, or do some quick sketches. I don't do that often enough to justify carrying another device like a tablet, but regularly enough to feel limited by the absence of touchscreens.
I actually quite like the UI of MS Office, but nevertheless I don't understand why so many competitors try to make clones. Say what you want, but MS has a huge head start here and everyone else is just making worse looking copies of the way MS Office looked years ago.
And of course, is this really the final form of office applications? Is it maybe time to just go back to the drawing board, think about workflows, the current state of technology, future trends, and build a UI that works maybe even better, looks cleaner, fits on more screens?
Somehow, .NET jobs seem be tied to waterfall processes ("but we are still agile, because we release two times a year"), requirements in OneNote, and a 5 kg Windows laptop.