> This ... is actually more elegant and useful than RSS in numerous regards, at least for my workflows. (Though a flipside view might be that Mastodon / the Fediverse is more addictive and a greater timesuck).

I mostly agree with you on this. In fact, this concept somewhat came from a fediverse/activity_pub thing I was working on awhile ago: https://github.com/pubcast/pubcast

The concept of having an "inbox" and "outbox" and then just interlacing with everyone else really hits that part of my brain.