[upofadown]

GPG decrypts to standard output (by default), can take input from standard input so that Pass uses this to avoid plaintext on storage media. The issue that /dev/shm addresses has nothing to do with PGP. It is when you want to use a text editor to modify an existing multiline entry. Then the text editor needs a file to edit.

[est31]

Fair points, I've checked source code and you are right, shm is indeed only used for editing, otherwise pipes are used.