The worse thing about the desktop/Electron version is that they are really bad about keeping the electron version updated so the browser version will support screen sharing on Wayland while the desktop app doesn't.
Teams is more complex than Slack but also does more, but it's also not a complete superset of Slack, so unplanned/unguided transitions from Slack to Teams tend not to go well. Like any sort of knowledge management change, it can go well with empathy, planning, and care.
Perhaps that's the problem. I generally prefer the right tool for the right job, and once I have a tool that works, the effort to switch needs a compelling reason.
Adding a "hammer" function to a screwdriver makes the screwdriver worse, it doesn't provide that compelling reason.
Adding multi client access, stored chats, and even some formatting, were compelling reasons to switch to slack over irc.
[0] https://microsoftteams.uservoice.com/forums/555103-public/su...
[1] https://github.com/MicrosoftEdge/WebView2Feedback/issues/645...