I’ve seen a lot of Dave Winer saying his blub is good enough and abstractly that ActivityPub is too complex. There’s pixelfed too. Practically if I want to have an ActivityPub feed for my blog I might host in on Mastodon and if the character limit is too little you can have a server like

https://writefreely.org/

If anything characterizes the RSS community it is a lack of imagination and rejection of the last 25 years of work in relevance, ML and UX. RSS readers are still failing with the same failing interfaces that failed 25 years ago.

That said, the people who are still using it feel satisfied and other than Rachel that aren’t a lot of people who will try to stop you if you do try something ambitious. You just gotta poll poll poll and poll poll poll some more or pay somebody to poll poll poll for you.