You've got a naive way of looking at Einstein's skepticism towards the foundations of QM. He wasn't like one of the modern day quacks trying to disprove QM or

You've got a naive way of looking at Einstein's skepticism towards the foundations of QM. He wasn't like one of the modern day quacks trying to disprove QM or SR/GR. He helped to build QM and got his Nobel prize for the photoelectric effect which showed that light was quantized and essentially discovered the photon. His argument with QM was that it had to be incomplete in the same sense that Galilean relativity was correct but incomplete, and he didn't accept that physics could be non-local. By applying that principle he proposed the EPR paradox which led to Bell's inequality and the Aspect experiment. He bet wrong on the outcome of that experiment, but it wouldn't have happened without his theoretical work in first proposing the experiment. The fact that he guessed the outcome of the experiment wrong is almost irrelevant, although in our culture of boosting the profile of people who get lucky and guess correctly that is probably difficult to see.