First "but it doesn't scale". Now "but integrations".
There will always be another "but", and there will always be a link on the internet showing that it's been done already.
"but shiny web gui" - https://thelounge.chat/
"but mobile app" - https://github.com/MCMrARM/revolution-irc
"but it's complicated" - https://www.mirc.com/ since 1995
IRC does have limits. Some. One is that to make it "modern" it needs a bouncer - that said znc is spectacularly simple to set up with it's web interface.
Integrations were never one of those limits. Just google IRC bots.