Waaaaaaay better clients (this is the big one), chat logs that are easier to search through with standard unix tools, avoids issues with OMEMO breaking (which stops people chatting at all, breaking the main usage of the program). Saying this as a regular user of both. I spend way more time on IRC and I enjoy irssi much more than Gajim, Dino, or Conversations. I do think XMPP has potential, though.
Waaaaaaay better clients (this is the big one), chat logs that are easier to search through with standard unix tools, avoids issues with OMEMO breaking (which stops people chatting at all, breaking the main usage of the program). Saying this as a regular user of both. I spend way more time on IRC and I enjoy irssi much more than Gajim, Dino, or Conversations. I do think XMPP has potential, though.