Very few host their own webid and are able to log in to a federated instance with PKI, like with the old FOAF+SSL
I think the Federated model was worth trying.
But a few years into it, it's demostrated major weaknesses, which essentially rely on you trusting your provider. Indeed in mastodon, your private keys are leaked to the server.
Instance owners, no matter how well meaning, will sooner or later exert their control of a user's identity.
Nostr is the only model that works, so far, if you want to own your own identity on the social web
