I know there are technical ways to work around IRC's limitations, my point is that their mere existence adds more friction to using IRC so people move on to more frictionless places - and with chat apps being fundamentally social, that friction affects people who don't even mind the frictions themselves but their peers do (though personally i do mind these frictions - i do not want to bother with hosting anything or setting up bouncers or anything of the sort, i just want to pop in a channel, see what people were discussing, talk with whoever is there and/or share some of my own stuff and that's it).