Looks mostly abandoned to me:

https://github.com/keybase/client/graphs/code-frequency

https://github.com/keybase/client/graphs/contributors

I got a 6.0.1 update for Keybase like yesterday. I agree with the sentiment, though, feels like it's in maintenance mode. But its core value prop and feature has never stopped working. Point was that it's there and it works and if it's the UX model you prefer then by all means, use it at least until someone comes and reboots the concept.

I think a lot of people abandoned it after Zoom acquired it.

Anecdata point, I jumped ship as soon as that became public.

Zoom is a looooong way from having the sort of trust that Signal/WhisperSystems have in my mind.

(Which is a pity, I really liked the idea of Keybase.)