To clear up a misconception: there is no evidence for pilot wave theory beyond the evidence for standard quantum mechanics itself. And I say that as a proponent of pilot wave theory. The droplet experiment you reference is a physical model that represents some aspects of pilot wave theory in an extremely limited way. Calling it evidence for pilot wave theory is like building a mechanical model of the solar system and calling it evidence for Newton’s theory of gravity.
It is true that allowing for a privileged frame or foliation of spacetime is a way to reconcile the non-locality of quantum mechanics with relativity, which is a step towards a theory of everything.