I question the value of telling people who can't yet hit to their full potential nor understand the pants soiling mind squellching effects of adrenalin in real combat that the first thing they need to learn is technical control.
And I question the value of telling someone to focus on power when they don't yet have the ability to generate power or apply the technique properly.
Chances are in the beginning they are just going to learn to improperly load up and/or overextend/rotate.