I think that the reason is the same for "why is XMPP mentioned more than IRC?". IRC has more clients, it's less resources hungry and simpler than XMPP.
I think that the reason is because it is old-fashione, and it's clients feel outdated and (native) "lacking features" compared to more popular clients like Discord, WhatsApp, Messenger, Telegram or Signal. 🤷♂️
I can imagine my cousins using any of the clients I mentioned before, but not IRC, XMPP, or any protocol from my era. Life and traditions, isn't it?
Disappointing and poorly crafted ending. There are scenes from the trailer that doesn't include in the final game.