Earlier quoted context omitted.
This is the real answer. casual users just want to Press button->Receive bacon. If anything looks lame or hard, their limbic systems will direct them right back where their freidns are. "Matrix? Dude just get on Discord we're forming a party right now."
That's a weird and kind of egotistical way of saying that it's a platform that doesn't ask you to invoke the Olde Magycks in order to make it do the thing you want to use it for. IRC asks you to invest before you use it, IRC needs you to care first. Discord does not need you to care about it in order to use it. It works even if you actively despise it.
Discord definitely wants it that way, they are for sure thinking about the moment when you are trying to get in game fast and easy, and nobody cares to switch their platform, especially to something unfamiliar.
The thing about the limbic system is that you're gonna feel the pull to just come along. If your casual game group is just doing that, its a pretty hard sell when everyone already is using Discord and if they arent its extremely fast to begin, well known and even works in a browser.
If by egotistical you mean believing oneself to be better and more important than others, I disagree: I've had this exact experience, what would have been egotistical would be demanding they use mumble or matrix instead of the thing that already works for everyone.