I don’t understand what people are seeing in terms of issues. Maybe once or twice my comment or someone else’s seemed to not be fully synchronised. And Kbin had some notification issues (processing backlog), but the federating problems seem far worse on the Lemmy side. Lemmy has outright protocol bugs.
I wonder if a lot of people are seeing the Kbin error message and assume that is “federation”, when really it’s a host of things that still need to be ironed out site-wise. For example, there is clearly a maximum file size allowed for a photo, but I don’t think there’s a warning coded in there yet, so try to post something too large and you get a site error, reduce the size and it works 100% of the time. That’s not federation, that’s simply Kbin being very new.
And lo and behold it seems like Lemmy’s fault the Kbin isn’t federating properly (blocking inbound Kbin traffic).