I'll add more:
- Fries CPU and GPU on video calls, making it difficult to use other applications or demo when screensharing
- Interacts unfavourably with at least some WiFi drivers leading to unidirectional and bidirectional losses of connectivity
- Copy and paste randomly break so you can't copy content from Teams or paste anything into it; applies to both text and images
- Doesn't honour setting not to automatically restart which makes it hard to kill when it needs to be restarted
- Automatic restart means it often restarts before it's cleanly shutdown leading to reoccurrence of the problem you tried to kill it for in the first place, or other random bugs and instabilities
- Too slow to start up and load channels: show the cached content immediately - stop blocking on bloody network calls like it's the 1980s and you've never written any code that calls over a network before
- Causes system instability on video calls with multiple participants
- No feedback on image paste/upload: is it uploading or not? You don't know. Leads to images that you thought hadn't worked just randomly appearing in the middle of typing - not very helpful. Put a placeholder (ideally correctly sized) where the image will go on the client whilst it's uploading and then get out of the way.
- Doesn't seem to be possible to resize/rescale images
Could think of plenty more but I should do some work.
(And, despite all of the above, it's still probably the best of a bad bunch - Hangouts call quality is often terrible, and Zoom is just a complete mess when it comes to anything beyond the basic video calling functionality.)