If a private key of an account is compromised, this type of verification/attestation helps with the recovery as the Nostr Address (NIP-05), name and other new metadata (like additional keys) can remain uncompromised and still useful to determine who the profile originally was before the compromised private key of the account, as it could change. The orginal author can also inform others of the compromise by revoking the key, changing the NIP-05 and etc. If additional keys were added to the users metadata, the revocation could include signing an additional message (including an honest new profile).