I'm fine with getting rid of forward guidance but concerned Warsh is not disclosing the monetary policy reaction function - how the Fed would adjust as the economic environment changes. Relying on financial markets won't work because markets price to what they think the Fed will do.
Monetary policy works through financial conditions. If markets don't understand what the Fed is doing, transmission slows and becomes less efficient. You need to provide guidance about how you'll react if things evolve differently.