this exists in latest so kbin.social should get it once the update is out. some kbins already have it (it's /federation for them, though)
unblock all domains if you can't see comments
posting from here since fedia is down atm; you're most likely hitting https://codeberg.org/Kbin/kbin-core/issues/1019 so you can't see comments. I think people in the previous (though now deleted) thread had addressed your other concerns, but yes there's still a lot of development work going on, and other kbin instances tend to be more up to date than kbin.social, ironically, perhaps, though that's risky as they can also break in different ways taking in updates quickly
edit: this comment might seem a bit out of place now that I reread OP, in their previous post that was deleted they mentioned people had replied but they couldn't see any of the comments, so that's what this is in response to