One thing I learned during 35 years in education: if you move on as soon as students demonstrate they can recall the information you taught, it will be replaced with what you teach next.
Deming was focused on standard inputs, processes, outcomes, and the manufacturers had the option of closing. Anyone who sees school in a similar fashion has a misguided sense of school.
The best teachers define and prepare lessons that engage students, and instruct when appropriate. If you need always be instructing, you do not understand learning.