Agree. The PR as proposed is just for metadata (I was trying to keep it simple) but we could change it to do the encryption as well, solving both issues at the same time.
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This is cool in the sense you can have a mode where you have to establish a link before you can start communicating, this is something @semisol tried to do awhile back but this appears to achieve the same thing? Just send a giftwrap of key aliases to the user to let them know how to contact you. Neat.
It's a DM-specific solution to what @fiatjaf was trying to do with decoupling encryption and identity: 
GitHub
nip4e: decoupling encryption from identity by fiatjaf · Pull Request #1647 · nostr-protocol/nips
this is inspired by MLS, but much simpler, and definitely not trying to be a group communication system, but only a way for users to encrypt things...