I'm not sure I'd still say that. MS has come a long ways with onedrive/office 365 on collaborating on files.

I also feel MS is moving more and more towards a cloud-first type thought process like google does. Their issue of course though is a lot of inertia from their customer base. (Which I can certainly understand the resistance.) For enterprises, they have versions of office 365 that are cloud only capable, and can only work on files that are stored on onedrive. My idiot university for the purposes of saving money likes to hire some non-full time staff and assign them these licenses, and then when you run into the problem of them not being able to edit local files, their answer is along the lines of "what, you haven't moved everything over to onedrive?", never mind the many shortcomings that has when it comes to retention.