I think we are missing each other a little here. North South is not Top Bottom. It is about intent to go back to front with extension toward the pitcher. Technically if you are in the northern hemisphere it is south north if your compass is facing north toward the pitcher. Imagine the compass placed over the transverse plane.Teaching a young hitter the mindset of attack everything north south can be extremely confusing. The players who understand how their body should react to pitch location will adjust to pitches of all different heights accordingly. High pitches are east-west.. because the body isn't tilting as much... the bat still follows the same path around the shoulders/deltoid. Pitch location dictates east-west or north-south. Asking a kid to go north-south on any pitch is not teaching a good thing, it's a flaw and confusing IMO. Immediately the kid will tilt on every pitch and it's game over at the higher levels.
I'm not saying teach east-west either, I'm saying adjust to pitch location, let your body dictate whether it's east-west or north-south