I definitely agree with this sentiment in terms of general UX and performance. I can't find a lot of messages and files that I'm looking for because it's so badly structured. And it has a very noticeable lag whenever I perform any function (clicking on "Activity" out of "Chat" for example).

The only good thing about it is video calling. Without testing this, I always feel it's much faster/smoother and has better screen sharing quality. Also the launch screen does a great job (in comparison to Zoom for example)