[belthesar]

This doesn't address everything, but I thought I'd chime on specifically on the chat history question. It's still early days for support from most IRCd's, but IRCv3 has been slowly bringing protocol level support for many of the same features that Slack, Teams (chat), Mattermost, etc. have, including chat history support. It's likely not reasonable for the public IRC networks to ever support history, but for a self hosted IRC server to service your team/company/community/whatever, it would be totally feasible to connect and receive scrollback.

[varenc]

I did not know about IRCv3! These are the HN insights I love. I wonder if IRCv3 is still semi-usable from a raw telnet session like old IRC is? I remember using that in the early 2000s when I wanted to get on IRC but didn't have a real client.