There has recently been published a multitude of books that attempt to defend the underlying truth of quantum mehanics – its conceptual basis and philosophy. It is righfully said that the formal expression of (nonrelativistic) quantum mechanics correctly predicts all sorts of experimental facts, not predicted by the classical Newtonian theory, such as applications to solid state devices, lasers and masers, atomic and molecular spectra, etc.
But this was also true of Newton's theory of gravity. Yet, it failed in yielding an acceptable conceptual base. Newton himself complained that he did not understand his theory of gravity beyond its description of gravitational phenomena. Three hundred years later, Einstein provided an explanation of gravitational phenomena with a field theory, totally different than that of Newton, conceptually and mathematically. This theory then gave back the formal expression of Newton's theory of gravity, as a particular mathematical approximation! But it rejected the conceptual basis of Newton's theory of universal gravitation.
Just as was the case with Newton's theory of universal gravitation, the quantum theory fails as a conceptual understanding of atomic phenomena, though its formal expression can be a mathematical approximation for a closed field theory, such as general relativity, in expressing an underlying explanation of the atomic domain of matter.
Recall R.P. Feynman's statement about the basis of quantum mechanics (as proposed by Bohr and Heisenberg):
"What I am going to tell you about is what we teach our physics students. And you think I am going to explain it to you so you can understand it? No, you're not going to be able to understand it. It is my task to convince you not to turn away because you don't understand it. You see, my physics students don't understand it either. It is because I don't undersand it. Nobody does". (R. P. Feynman, QED (Princeton, 1985, p. 9).
I disagree with Feynman. It is my view that it is our goal, as scientists, to understand a physical phenomenon, not only to describe it! We cannot be satisfied, as Feynman pleads, to only describe a quantum phenomenon. As scientists, we must seek to understand it. The alleged basis of quantum mechanics does not provide this understanding, as Feynman confesses. It has been my assertion that Einstein, Schrodinger and Dirac were correct in searching for an explanation of quantum phenomena, not only their description.