Interference phenomena are key.
One can get action at a distance -- even over hundreds of thousands of kilometers.
One can engineer gravitational and inertial effects.
One can engineer the nucleus, including transmute it, easily and cheaply. One could clean up all the nuclear wastes.
Electromagnetic energy can be produced at a distant target, or extracted from a distant target.
This is not energy transmission through space in the form of EM force fields. Instead, it is transmission through spacetime in the form of electrogravitational potentials.
Conventional EM shielding is ineffective against scalar EM.