I'll be tarred and feathered for saying this, but every time I see a modern chat app I pine for the days of ICQ (as it looked in the 90's).

It had a UI I prefer over anything since - compact, comparatively unobtrusive, information-dense, and fast. I could port my full chat history around with me between machines, and also search it reliably (no vanishing scrolling or lazy-loading handicaps). And it was handy you could advertise different presence states to different people/groups.

IRCv3 | Hacker News
https://news.ycombinator.com/item?id=50041540