It was once a really great place to follow developers and artists. My feed was once a gold mine of tips and tricks and interesting projects that other people were working on.
It wasn't just for unhealthy political discussions, as a lot of HN posters like to make out. I managed to block all of that out, for a time.
It was actually the best place to follow developers and artists, and a lot of niche communities had a home there. A lot of accounts just posting artwork or ephemeral things. Unfortunately the "lol woke mind virus" crowd won and Elon came riding in on his white horse to wreck it all.
I must be living in some bubble, because not only I have never had an account there, I also do not know anyone who would be using it.
From my perspective I'd judge the popularity of Twitter to be similar to e.g. Soundcloud - people know what it is, but very few people use it.