i can't believe i'm saying this - i just realized that i want #usenet groups back.
edit: before i get more replies, i've been a usenet user/subscriber for 30 years, and i still use it daily. i'm very aware that it's still in heavy usage.
to clarify - I'd like to see a usenet back, minus the "big 8" cabal, minus 200TB / day binaries, and all of the ugly crap we've seen since the 80s.
i'd like to see something like a new usenet offering activitypub integration, minimal data transfer (text-only), and easy group management.
