GPG support? (like SSH)

Just to throw my opinion into the mix: SSH keys cannot be substituted for PGP keys in all cases. A PGP key is closer to a digital certificate than it is to an SSH key; whereas an SSH key is really just a raw public key with a tiny amount of metadata attached, a PGP key can and generally does contain a wealth of additional metadata, and is also used for a much wider variety of purposes, like certifying other public keys or containing attached subkeys.

In concrete terms, an SSH key cannot be substituted for a PGP key for many use cases, like E2E encrypted email, YubiKey, cryptocurrency wallets etc. If 1Password were to support a GnuPG authentication agent, it would make storing private keys in a centralized location easier and more secure, and the process of performing common PGP-related tasks more transparent.

While GnuPG is pretty widely supported nowadays, and there is a wide variety of FOSS out there for managing keys, having my PGP keys stored in 1Password would make life a little easier. It's a small quality-of-life improvement, but not really a significant ask from me personally. I use 1Password because it has the best user experience and broadest compatibility of all of the password managers I've tried, and I intend to keep using it regardless of whether or not PGP keys are supported.