Why are people people? For nearly any policy change, you can probably find 20% or more of people who would not have made that same exact choice. Many of them,

Why are people people? For nearly any policy change, you can probably find 20% or more of people who would not have made that same exact choice. Many of them, if left to their own devices, will persist in disagreeing, slow-rolling, being mildly obstructionist, or similar. If you don't have a clear (and enforced) principle that requires the implementation of made decisions and bars re-opening discussion absent material new information, you'll end up with an organization that lazily drifts towards the new decision instead of aggressively pivots towards it. That's clearly accepted in some companies; it doesn't seem to be accepted at Amazon.