A coach, trainer or beginner would be stupid to try to produce maximum force in low rep's.
if the neophyte was keen to compete, then single rep* training * is a must, but only when the trainee is strong and skilled enough to handle single rep's, how long that takes depends on the one being trained.
if I was training a young dude to powerlift, he'd need to be and look strong first! and that's not just big biceps and boobs.
he'd need to look big and strong from all angles, big round back and strong hips and legs.