Im pretty satisfied with Lemmy, but one thing i wish you could do is browse instances. Like i wish there was a way i could almost emulate being on my programming.dev account and see all that instances communities while im logged into this account. Afaik theres no easy way to do that without visiting some aggregator website. It would be nice to do within Lemmy itself.
It’s just a different protocol that makes different trade-offs, so it can’t use AP protocol. Nostr is an underlying protocol in the same way that AP is, so you can build twitter clones, reddit clones, video streaming services, etc on top of it just like you can with AP.
Nostr’s key difference IMO is where your identity lives, and nostr decided not to have it tied to a particular instance. AP decided to have it tied to an instance, that is a pretty fundamental part of the AP protocol and is the same way e-mail works.
AP did not tie it to an instance. It left it up to clients and platforms. Mastodon tied identity to instances