Quality is the result of a carefully constructed cultural environment. It has to be the fabric of the organization, not part of the fabric.
In a true zero-defects approach, there are no unimportant items.
Very few of the great leaders ever get through their careers without failing, sometimes dramatically.
Being convinced one knows the whole story is the surest way to fail.
Selecting the right person for the right job is the largest part of coaching.
When in doubt, delete it.