I really couldn’t care less if I can follow a Lemmy community with my Mastodon account or comment on a PeerTube video with my Lemmy account.
Don’t get me wrong, it’s neat and a cool achievement of the ActivityPub protocol, but that’s like advertising that your awesome new solar-powered, self-driving, flying car also has power windows. I’m glad it’s there, but there are way better things to talk about, especially when trying to convince a newcomer to jump on board.
Only because it’s mostly broken. In a world where these features are fully functional, this is absolutely a killer feature. Lemmy has particularly bad support among the broader fediverse and that’s certainly impacting how much of it you see.