I haven't used Teams in almost two years, but when I did I never felt like I was sure "where" I was, or where anything else was. I'd find myself "somewhere" not have no confidence I'd ever be able to get back. I hated using it. Anything I cared about I'd copy out, or keep notes, including stuff that I'd absolutely leave to Slack to keep for me (so, middling-important stuff).

Lots of enterprise UI is like that for me, actually, including most PM software more complex than GH issues + boards. I find them extremely uncomfortable to use because I'm never confident I'm doing the right thing, or that what I'm doing is safe to do, or whether I'll be able to find the things I need again.

Slack is heading that way with some of their changes (the way drafts and threads are handled is juuuuust on the edge of putting it in that territory) but I still never feel "lost" for long, on there.