[bsder]

Einstein also had a bunch of real, substantial objections.

One of the big ones had to do with whether the "fields" formulation was valid and primary. One of the issues is that if you follow the fields formulations that Einstein believed in out to conclusion you get things like "atomic oribtals never decay".

Which, of course, is obviously wrong. And an example of one of the reasons why Bohr is considered to have won his debates with Einstein.

Except

Einstein was right! We now know that when you isolate an atom, it's atomic orbital decay gets slower and slower the more you isolate it.

The problem at the time was that all of the experiments that could be run were statistical aggregations and obscured the nature of single state quantum systems.