Back in the day Discord's advantage was that it provided a way for people to set up a voice communication server with push-to-talk without any technical knowledge and for free. I don't know how they're ahead of competition now.. I don't know what their killer features are.
I use it occasionally but there are a few problems that always drive me away . 1) I have muted all the servers but I still get occasional sound notifications and just cannot find any source for them, might be a bug 2) there is no global notification history. To me that seems like a must-have feature and I don't know how people stand to use discord without it 3) ui feels very clunky. To me it seems like I spend way too much time navigating through the ui and searching for things. For example, scrolling through the servers and trying to remember which icon was which. Anyway, I would be interested in hearing why people do use it besides everybody being there.
I run Linux on all home computers, MacOS on work devices.. if AMD's 8x40 APU turns out about as good as it's rumoured to be (efficiency-wise) I'll probably try to get my company to get me a Framework laptop with that and then all will be well.
Anyway, I'm pretty sure Steam Deck is having an effect here. Not only do they seem to sell well on their own but people may get ideas when they see Linux-based device running games decently..