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.
AP did not tie it to an instance. It left it up to clients and platforms. Mastodon tied identity to instances