Not sure where the discord hate is coming from (besides the new mobile app). If you're someone who has to use Teams for work, surely you'd kill to switch to Discord instead.
Imo it was unusable when the new UI just came out. It was sluggish af, and would take significantly longer to cold start.
I still don't like how a lot of buttons that used to be easily accessible from pretty much anywhere are now behind submenus or flyouts or whatever, but at least it's usable now.
What do you use? Skype, teamspeak, mumble, ventrillo were all blown out of the water by discord imo, except for niche things like the whisper feature on ts for large groups
Discord, cause everyone is there. Curse Voice had it stomped by miles, any chat room had the chatroom feature beat, anyone could design a better UI, but it has everything in the same place, and I think being free and custom bots gave it critical mass.