I think this is exactly why it's getting all the hate. People being forced to migrate from Slack to Teams. Not only do they lose years of archives, but the UX and features are a huge downgrade for such an essential tool.
If it was zoom -> teams, i don't think anyone would care so much.
I made something similar, albeit less stylised, a while back.
It's got animation. I'm not sure it's the ideal way to do it, but have a look if you want. I describe the approach here: https://bardhovde.com/posts/miko/
If it was zoom -> teams, i don't think anyone would care so much.