> what are you asking the devs to encrypt here that they haven't already? In other words, what's the problem?

I recommend the devs (1) implement payment channels so the sender can create his payment data on a second layer instead of the base layer (2) implement onion routing between payment channels so that even the sender's channel counterparties aren't in a position to know if he's the sender or not (3) within those channels, actually encrypt all communication between counterparties so that ISPs can't read it (4) do not publish payment data on a blockchain, not even the encrypted blobs transmitted between channels

Or, you can just use lightning, because it already has all of those features