I am also using busy.org more and more lately, it has much more useful info than steemit, but there are a lot of hiccups to the service. What I am really missing on both sites though is an easy way to navigate my own posts; some times I want to go back to a post but can't remember the title or the date, and I play a kind of guessing game with the weird search engines.
Anyway, it is very convenient to have all those sites in a handy compendium like the one you made, some of these sites look very promising. Certainly, you gave me some homework to do! :)
Finding old posts can be hard. I sometimes resort to Google.