Ive thought about this subject a lot since i started coaching, trying to mold myself into a more effective coach. I still am unsure how to get the most out of kids at the age i am coaching. I guess what I have learned so far is that no 2 kids take a single approach the same way. One i can light a fire in their eyes by getting on them, get on another in the same manner and the fire dims.
When I played in high school ball, my coach was known throughout the region as a real ball buster, but the most technically sound coach around. My junior year he thought it was the weakest year, as far as talent, so he took a sabbatical to coach college and finish his masters. Laid back assistant coach takes over and we dominate and win state.
I really think the ball buster coach prepared us and taught us the game. When he left so did the pressure, we flourished. I'm new to coaching so we shall see, but I think every club may need a little of both, one to bust your balls and one to just let you play.