I see your point, but I prefer to see the passphrase that protect my GPG key as a bonus time to revoke it and generate a new one in case my key is compromised,

I see your point, but I prefer to see the passphrase that protect my GPG key as a bonus time to revoke it and generate a new one in case my key is compromised, rather than a protection sufficient to assume that the encrypted version of my key can safely be public.