Ways in which monetary policy became highly asymmetric (some individually defensible but collectively not, many since abandoned):
1. SINGLE MANDATE. Required maximum employment before liftoff, not balancing the magnitude of shortfalls/deviations of employment/inflation.

2. TARGET. Should run inflation higher to make up for shortfalls but don’t run lower to average out after periods of high inflation.

3. FORECASTS. Do not tighten premptively based on forecasts that inflation will rise in the future but hold off tightening based on inflation will fall in the future.

4. POLICY. Cut rates or expend balance sheets very quickly but only raise rates or reduce balance sheets gradually.

All of these have compelling arguments for them. The one that was probably least defensible was 3 (rely on forecasts to avoid tightening), also the one they most clearly have abandoned.