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I think that the reason is because it is old-fashione, and it’s clients feel outdated and (native) “lacking features” compared to more popular clients like Discord, WhatsApp, Messenger, Telegram or Signal.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?
When you create a filesystem, there is a parameter named as “block percent free”. This parameter should be “5%”, so a 5% of your partition size can only be written by the “root” user.
You can decrease this value or just free some space. You can try to create files or folders as root as well.