 Nowadays, there is a general consensus that this solution is absolutely unacceptable. It corresponds to assuming that the linear nature of the theory is broken at some point, without clearly specifying when. Thus, quantum theory is unable to explain how it can happen that apparatuses behave as required by the WPR postulate (which is one of the axioms of the theory), instead of satisfying the Schrödinger equation. Even if one were to accept that quantum mechanics has a limited field of applicability, so that it does not account for all natural processes and, in particular, it breaks down at the macrolevel, it is clear that the theory does not contain any precise criterion for identifying the borderline between micro and macro, linear and nonlinear, deterministic and stochastic, reversible and irreversible. To use the words of J.S. Bell, there is nothing in the theory fixing such a borderline and the split between the two above types of processes is fundamentally shifty. 