> I am not aware of anything even on the fringes of science that would permit a superior communication technology over EM

In another comment you mentioned things such as gravity waves, neutrinos, etc. You also mentioned that these things are far more expensive to generate than EM. I think those particular facts are "engineering problems to be solved" rather than just fundamental laws, yea? I never fired off a neutrino, I know you need a sun or a particle accelerator to do it, so I get why it's considered expensive, but is that inherent?