That was just me being goofy in that bit (and only that), but I hope the rest of my message went across. :)

> In fact for file storage why not use an encrypted disk volume so you don't need to use PGP?

Different threat models. Disk encryption (LUKS, VeraCrypt, plain dm-crypt) protects against physical theft. Once mounted, everything is plaintext to any process with access. File-level encryption protects files at rest and in transit: backups to untrusted storage, sharing with specific recipients, storing on systems you do not fully control. You cannot send someone a LUKS volume to decrypt one file, and backups of a mounted encrypted volume are plaintext unless you add another layer.