In the past two years, I have had horrible issues where it decides that I'm not allowed to join the call because I have a Teams account logged into a different organization, that it won't let me log out of. An issue where Microsoft servers just time out if you have ipv6 enabled, etc.
Don't get me started on Skype for Business. It's still around.
When have Comcast, Disney, or IBM ever have been on the wrong side of history? /s