I don't think that the RPMs that I have created in my internal repository and deploy to my field systems are a 'known information' to anyone outside of my organization. If they are, I'm in serious trouble.

I think a more realistic use case for package-level encryption is deploying RPMs that have secrets in them (either keys/creds in configuration or trade secrets in application logic). Ideally of course we should encapsulate these such that they aren't deployed to field/embedded devices but in embedded there certainly may be some use-cases and requirements that those of us used to working in data center and cloud computing aren't immediately thinking of.