I'm thinking of sending files to people. Large dumps of documents and other data from several GB to several TB. Imagine that any of the following apply:

* The data is in a secure location and can only be exfiltrated by the internet, not via a thumb drive. (And so my connection will be closely monitored.)

* The data needs to be sent to someone with whom I don't have another means of secure communication. In other words, I can't use symmetric encryption with a pre-shared key.

* I or my correspondent have slow or unreliable internet connections and maintaining a direct connection between each other would be difficult or impossible for the length of time needed to transfer the data.

* I or my correspondent are being closely monitored by the authorities, such that connecting directly to each other or using intermediaries that would allow us to do so is an unacceptable risk.

If any of these situations apply, I can't use Wormhole or similar approaches. I need something that will allow me to encrypt files for my correspondent without a shared secret, where I can upload those encrypted files to a service like Google Drive for them to download on their own time. This is precisely what PGP does.

I don't think it's unrealistic to imagine situations in which a source or journalist has one or more of these issues. I would very much like to see an alternative for use cases like this one. I'm in agreement with you that PGP is bad in many ways, from usability to the cryptographic implementation. But it's hard to deny that it's a remarkably robust solution to problems like this one.