I mean Microsoft Word, the word processing tool that runs as a native app on one's computer. The degree to which the online or Teams versions do not play nice with the "real" one is a HUGE own-goal by MSFT and reason enough to avoid them if you can. If you're going to have an online tool called Word, it damn well needs to work EXACTLY LIKE THE REAL VERSION.
Now where it all goes pear-shaped, is not the technical side of it all, it's the UX and marketing teams that got involved. One big example is the "save" dialog that's been butchered beyond describing (even in the standalone desktop version of Word) in order to promote OneDrive and other microsoft offerings.
Downloading a lot of files off Teams usually fails and gives a load of html files.
The ‘integration’ nag for one drive which can’t be dismissed or enabled but seems to work.
It’s an absolute mess and I’m very surprised to encounter someone who finds it works well.