Or: "Should Finance People be allowed out unaccompanied by a macroeconomist?".
If the central bank is doing its job right, monetary policy ought to appear to be irrelevant.
The Economist says (HT Mark Thoma) "Interest rates do not seem to affect investment as economists assume", and this means that monetary policy is irrelevant. (Let's just set aside the fact that monetary policy is not interest rate policy.) The Economist refers us to an empirical study by S.P. Kothari, Jonathan Lewellen, and Jerold B. Warner.