I don't need Slack to do voice calls. I could use something else for it. It's just that the things that Slack is good at, Teams is horrible at, and Teams sucks for calls too. If someone calls me, the pop up that allows me to accept or decline the call should actually be responsive and not crash. When I'm browsing old messages, it should be able to render a simple text history without thinking about it for 30 seconds. When I get a message, the notification should occur every time instead of just when it feels like it. When I lose and regain my VPN connection, it should be able to dynamically reconnect without crashing or hanging on a disconnect message. If you're going to put document integration into Teams, why is there not a tab system for open documents I need to keep open rather than forcing me to use the history on the back button or otherwise reload the document by clicking through to teams->team name->files?