First of all, Pkarr was shared with Nostr folks especially Fiatjaf from day one, the reaction was always either Nostr doesn't need it or we can't change the Identity now it is too late. Secondly if you are willing to make a breaking change like Pkarr as the root identity, then might as well reconsider other unfortunate parts of Nostr that are bundled with the discovery layer for no reason, most importantly why would we use websockets and Nostr events as base API instead of HTTP verbs, headers, and semantics? just because Nostr made that bad decision? Why not build a datastore like WebDav and then advertise that event (PUT/DELETE) on Nostr relays? Well, pubky core only engages with Pkarr and data stores. And it doesn't tackle discovery so Nostr can be that for Pubky or not. But note that Pubky didn't take away anything from Nostr, anymore than Blossom takes away from Nostr, if anything wr just decided to use the tried and tested tech of web servers.