I'm a Fedia user and I made this thread on [email protected] this morning. It's doing great there! There are 10 comments, and you can see them on Lemm.ee, but none of the comments are viewable on Fedia. Weird. I've never had this happen before. A Lemm.ee federation problem, maybe?
Edit: Oh, I know what happened now. So, the first comment is from a startrek.website user, and Fedia defederated startrek.website. All of the other comments are replies (or replies to replies) in that user's comment thread. Therefore, Fedia missed all those comments.
I can't speak for @[email protected], but I wonder if the situation could change as the Mbin software evolves. Currently, we don't have user-level instance blocks on Mbin, a feature which does exist over on Lemmy. There is already a high-priority feature request for this to be added to Mbin.
Once users can self-select what instances they want to block, instance-wide defederations could in theory be more relaxed, as questionably-objectionable instances can be handled with user-side blocks rather than the current setup where defederation is really the only option.
Another thing that some Lemmy instances have done (@[email protected], you're everywhere, help me out; do you know where I might have seen this?) is setting up a default block list on the user-side. This is effectively an instance-wide defederation that individual users can elect to reverse, allowing another level of handling for problem instances. Ultimately, users win when admins have more options than full defederation available to them.
EDIT: I found it, it's lemmy.zip that does this:
https://lemmy.zip/post/33065677
Indeed!
I’m certainly willing to give startrek another shot - the reports about them were getting overwhelming at one point, which led me to blocking the instance.
Personally, I don't mind waiting for the software to catch up (user-level instance blocks) if that makes your life easier, but I don't know how representative I am or how long that wait will be.