Indeed, quantum systems exhibit nonlocal effects which are general properties of nature. These effects are not just a freak situations manufactured in subtle laboratory experiments.
However, if spatial coherence in such microscopic effects can be induced and sustained, then action-at-a-distance can be obtained in large macroscopic systems. This is the engineering aspect of the scalar EM approach.
It is also the aspect which the Soviets have secretly weaponized for over three decades.
The zero-vector EM force-field summation of multiple EM waves is used to transport specific time-phased patterns of EM polarization of vacuum to a distance. There interference of two or more such patterns results in the interference of the internal patterns, breaking of the phase relations, and appearance of positive (added) or negative (extracted) EM energy in the intersection region.