One thing genuinely confusing is having people reply to a comment I made from a federated instance, and when I try to reply to their comment, I get taken to the reply in the context of the lemmy instance they commented in, not the one I commented in. For example, if I'm on Beehaw and someone from lemmy.ca replies to my comment, and I want to respond to them, what I'll typically do is click on the button below the comment that shows the context of the conversation, because I comment a lot and don't always know what comment I made that someone is replying to. When I do that, it takes me to lemmy.ca, which I can't reply from, because I'm not on lemmy.ca. This is confusing, because this routine thing pulls you into other parts of the fediverse that your reply might exist in, and which other people can see, but you can't comment on that instance because you don't have an account there. But if you go back to your own instance and find your comment through your profile, you can navigate to a reply someone from another instance made and reply to them as long as you're still on your instance. This is both cumbersome and, to a new user, terribly disorienting.