I think the main reason is just performance. The official client is slow and slows down my computer. I have signed up and joined a few servers like Mario maker ones and the one for the diablo disassembly project (which I always forget the name). Currently, once in a blue moon I open it in search for mario maker IDs. However, I never spend any time there, as the chatting experience is not very good.

It's not very good because:

- notifications work badly for me (notifying a lot more than I'd like, I briefly tried to get it to only notify me when someone called me specifically, but I can't couldn't find a way that wouldn't involve going through all the channels

- it's slow and uses too much memory for my puny little pc

- it's hard to keep track of the last read message and current latest message. It requires clicks and it's clunky to use.

- this is a personal one, I find the interface really ugly and I value beauty in my UIs

If there was a server I was incredibly excited about I could put up with it. But given my mild interest, I end up never logging in. If there was a terminal UI that I could leave running in the background, not taking too many resources, I'd definitely leave it on a tab and interact on topics I found interesting, just like I do currently with IRC.