Imagine that your racket is twelve feet long. Would it be easier to get the momentum started (overcome inertia) by swinging it perpendicular to its lenght or parallel to its length?
Obviously, by "pulling" the raclet first, longways, buttcap facing the ball, it is easier/more effective to start the racket moving, then eventually change the linear motion into a pendulum-like motion.
Having said that, if you are happy with the way you play now, and never indend to get any better, then hit any way you like. It you have dreams of playing gracefully and at a higher level of play, someday, then listen to the coach.