Not sure if this is a planned feature, but not being able to block instances. I can do that on Mastodon so I expected to be able to do it here as well. Outside of the usual extreme cases where defederation makes sense, that would solve a lot of "lemmy.deez user said this! why doesn't lemmy.nuts defederate from them?" bullshit. Of course there's always the option of changing instance but you're never gonna agree 100% with the owner's choices when it's something you should be able to have control over.
Unless I somehow missed it I'm pretty sure you couldn't filter instances, only users and communities, but I just checked now and you can so maybe they've recently added it.
That's cool but that would only work on that app on that device locally, so it's not exactly ideal. I've only tried Sync and infinity so far, so maybe I'll check that out later and see if I like it.