Definitely !longevity@mander.xyz and (ironically) !cryonics@lemmy.world. This is literally a matter of life and death!

Also for the language !esperanto@sopuli.xyz and my home country !slovakia@sopuli.xyz, but revival there is already kind of happening.

Technically, I agree.

Practically, I myself have experienced several fragmented communities about the same topic with similar ethos. This was not a healthy separation based on different norms. It was simple, ineffective fragmentation. Or, at least the ethos and norms differences wasn’t clear.

I don’t know with whom you interact in Mastodon, but this in definitely not my experience there.