@jwildeboer IRC wins for discussions by not requiring anything. You want to chat? Click the JavaScript client link and chat. You can install a optional client if you plan to chat often. You don't need to register or provide any personal details.
Matrix/Discord etc all fail with onboarding and high hardware requirements for a client. I can sign into IRC using any computer with networking, even obsolete hardware. NetBSD on a Apple llc, IRC on a palm pilot. Take your pick.
@miah @jwildeboer Sure, IRC runs on anything, but it still doesn't work for most people. I say this as somebody who's spent over a decade on IRC.
To get the very, very basic, not at all optional feature "message history", you need to run a bouncer. Which is a tall order for most people.
The amount of people on computers too slow for Matrix is much smaller than the amount of people who can't/won't run a bouncer.