More people have HN accounts than bluesky accounts. Bluesky is pretending to be a public forum, while HN is purely proprietary and closed solution - I'd much prefer to depend on bluesky than on HN (despite already having an account). Also there are limits to acceptable self-promotion here.
>As for rich content, words are enough IMHO.
As you correctly noted, this is your opinion, that the author of TFA doesn't share.