I log into solid either with nostr NIP-98 or username/password or OIDC.  You can do the same with SSH.  Some VPS make you log in with password first time.  There's no real "defeats the purpose" of SSH.  Same with nostr, just use the right tool for the right job.  It's going to take years to transitions users from what they are used to, in any case.

https://image.nostr.build/11d185d5e99c342e60b49c93082b7929c9f81a8e871281a598c89aaf0507e681.jpg