#IRC bouncers like #znc are useful for the tiny niche of people who want their IRC presence to be separate from their client connections and to use different native irc clients without persistent backends. I use #irssi, #Irken, and #Holoirc on various devices with znc, and it works really well.
People who like clients such as thelounge.chat and weechat relays are already using bouncers, they're just integrated into the system.
I poked around a few months ago on the olden #IRC networks - IRCnet, EFnet, Undernet... The channel lists are just amazing dumpster fires, but what really bothered me is that I'd join a fairly populated channel and nobody would be talking. They're complete ghost towns.
I am a long time #IRC aficionado, but I've been reading the #Matrix protocol, and... I don't hate it. It fixes a lot of the problems with #IRC without introducing many new ones. I'm not super excited about http-all-the-things and json protocols, but it seems solid otherwise.
I don't think I'll really know how I feel about it unless I write a client for it.
The common sort of #lisp hacker, #MartialArtist, spiritual nomad, and father. I like #conlangs, #coding, and #BeeKeeping. I live near #boston. I run the cantos.social instance.