You know what great coaches are like? Carpenters. Carpenters that have a whole host of tools at their disposal-- carpenters who know how to deploy those tools at the right times, during the right projects, and for the right purposes.
You know what great coaches are not like? Cult leaders. Cult leaders who doctrinize exercise, who proclaim some movements “good” and others “bad”-- whose approach is not only anathema to science, but is also no good for their clients.