> By mid-April was in a usable state.

Do you mean April 2024 or 2025? Because the Teams I use on a regular daily basis is still unusable garbage. Granted it's better than February 2020, but it's still a train wreck of chats that don't work, calls dropped often, and files that won't attach to messages. Not that I am all that fond of Slack either.

I must be an unique snowflake, because I switched jobs around March 2020, and the new place used Teams exclusively, and... it was good. Not stellar, but good for the standards of software in this decade. Better than Slack, anyway. There were some weird glitches happening couple times a year, but nothing major.

So either I'm incredibly lucky, or - my going hypothesis - Teams actually does work quite well, if you deploy it along with SharePoint, Exchange, and other Microsoft products it integrates with.

I have experienced the same as well. I've been using team (on Linux for Christs sake) for past 3 years. Never had any major issues. Everything continues to be working as expexted. I'm using the web app on Chrome as a pinned tab since they are going to kill the Linux teams client.