I have used it quite often on Windows 10 in app form and had no problems with it, to be honest. In Win11 — if I’m not mistaken — it’s not a true app, more like a web app that runs in a kind of container, but beta testers have not reported anything weird so far. I have not come across any such report personally, at least.

Well, Teams that’s built right into Windows 11 — whether anyone actually asked for it or not — is one of its more talked-about features. If it does not work great, then people will give MS a hard time and rightly so.