Are you sure?
We are a ~15 person company and there isn't a (work) day where someone doesn't have problems with teams. I can't say for sure because I hadn't used it a lot but jitsi seemed way better and google while having far worse UX was more reliable. Like screen sharing stopping working (without any error or anything just stand bild) during a meeting is pretty common, or abstruse things like one time the chat was just missing until I restarted it or another time there was a partition of rooms until everyone left the meeting and then reentered it again.
Similar problems with outlook are also not that uncommon (but more rare), like e.g. calendars not syncing, the only things really speaking for it (compared to some other good team calendar applications) IMHO is it's integration with teams... which is worth something, I mean it's pretty convenient.
* Calling each other;
* Ad-hoc meetings internally, because our normal meeting platform has become cumbersome (GoTo);
* IMs
I see it'll do other stuff, but we're not really using those aspects. And I should also be super clear that I'm not saying Teams is actually GOOD. I have just found it to be better than any of the alternatives I've seen or used.
That's also very much how I feel about Outlook/Exchange. I mean, look, I'm a Mac guy. I use the Mac mail client almost but not quite exclusively; I also have an RD session up to a Windows VM all day every day for other reasons, and run Outlook there. The gap that drives me to Outlook/Exchange is scheduling. It just works, and works in a way that nothing else I've seen approaches -- even when messaging people outside our org.
I wish Apple calendaring was this good. I really do. But it's not.
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.
* Word
* Excel
* Honestly, Teams
* Exchange / Outlook, for group scheduling
MS software I use because I have the most experience with it, and am thus more productive than I'd be with something else:
* SQL Server