Seems kinda broken when sorting feeds. A bunch of fresh new posts load from the top regardless of sorting method after a few seconds. It pushes down stickied posts too, which suggests to me this isn't intended behavior. It's much worse when viewing all federated posts since those tend to come in quickly. Ideally it would only do this when sorting by new, and only if the user hasn't scrolled down.
This is only gonna get worse as Lemmy becomes more populated, so if there's a way to just turn that off entirely, that would be great.
I don't have anything to add to this except I expected and wanted all of the above from the Fediverse too.
However, one thing of interest I found while digging into things about ActivityPub: You don't actually need to create an account on anyone's server to participate in the Fediverse at all. You can interact with it directly from your own personal site i.e. a blog or an art portfolio. There's a Wordpress plugin for doing exactly this but I imagine there's other ways to do it without Wordpress. I might actually try doing this soon now that I'm aware of that.
I think the main rub here is Lemmy. Lemmy isn't a microblogging platform, which makes it so wildly different from other Fediverse platforms that it seems kinda silly that we're here even trying to poke at it from Mastodon/PixelFed/etc.