When in doubt, delete it.
Successful people breed success.
If we deliver on time, but the product has defects, we have not delivered on time.
In a true zero-defects approach, there are no unimportant items.
It is always cheaper to do the job right the first time.
The customer deserves to receive exactly what we have promised to produce - a clean room, a hot cup of coffee, a nonporous casing, a trip to the moon on goassamer wings.