One of the big issues that both Einstein and Bohr had was that the experiments available to them at the time were only statistical--actually creating experiment

One of the big issues that both Einstein and Bohr had was that the experiments available to them at the time were only statistical--actually creating experiments with single quantum states or small quantum states was just not feasible. For example, one of the arguments against Einstein's view was that Einstein's formulation implied that electrons in an excited atomic orbital would never decay. This, of course, is quite problematic as we know that electrons in atoms always decay. Except that they don't! When we put individual excited atoms in modern laser traps, we find that they don't drop from their excited state at the same rate. And the better the isolation, the slower that decay occurs. Whoops. So, the problem is that these two greats were arguing with each other when a whole lot of the experimental evidence was still quite shaky and sometimes even wrong.