Ask anyone today working on foundational questions in quantum theory and you are likely to hear that there is still no consensus on many of these questions—all the while, of course, everybody seems to be in perfect agreement on how to apply the quantum formalism when it comes to making experimental predictions.

Maximilian Schlosshauer, Johannes Kofler, Anton Zeilinger, "The interpretation of quantum mechanics: from disagreement to consensus?", Ann. Phys. (Berlin) 525, No. 4, A51–A54 (2013)