One can question the central bank's understanding of the functioning of the macroeconomy and the monetary policy transmission process, but that is a separable issue from the validity of independence. That said, the questioning of the framework itself is a vital quid pro quo for independence. The accountability of central banks to the political process and the public more generally is critical.
To be able to take independent decisions about the appropriate stance of monetary policy, a central bank has to appropriately justify them. While the combination of goal dependence and instrument independence in terms of monetary policy has stood the test of time, the equivalence in terms of financial stability is more an open question.