Retro tech. It's not too obscure, especially nowadays. I could talk long hours about how mind fucking blowing was the Amiga and then still how it went down on the drain... tho I just see on the other people that this isn't really the topic that will kickstart (heheh) the party.
Retro computing love is lonely irl but thriving online. So yeah definitely a topic we don't really bring unless you want to get a slice "back in my day" geezer action. Which honestly I'm leaning into these days.
I'm not even that old of a geezer (33), but I have fallen in love with some late 80s computers that never came to my country, like the PC98, Sharp x68000 and Amiga500.
Also, the Commander X16 looks like something I'd love to fiddle with once in a while, just because.
IRL, I've yet to find anyone even remotely interested in the topic.