Private-ish audio is solved with bone conduction, see the new Meta Rayban Glasses or the Bose Frames for example. There's more leakage than you get with normal

Private-ish audio is solved with bone conduction, see the new Meta Rayban Glasses or the Bose Frames for example. There's more leakage than you get with normal headphones, it's not something you could use in a church, library or cinema without annoying people, but it's private enough for most use cases.