My biggest problem with Discord is how so much stuff is moving to it. Got a problem, you're told to go to their Discord and ask there. Which makes it harder for discovering solutions when the next person has an issue. Since it's not indexed by an search engines (and let's not get started on the whole enshittification of those with the flood of AI misinformation), and Discord's search function is painful to use. I also find big Discord servers hard to actually engage with. They're great for my 5 or 6 person roleplaying group to mess around in between game sessions, but are just unwieldy with dozens of people.
Plus, with the Discord IPO coming, I'm pretty sure they're going to slowly degrade the experience. Feels like there's nothing like the quest for endless profit those create for ruining things that I once enjoyed.