As the video states, if you can find yourself in this position on the downswing, you’re likely going to hit a solid shot. Now with that said this doesn’t mean that your setup, backswing, transition and downswing can go haywire and do whatever they want. The professionals that make their odd swings work, make other adjustments to ensure that their swing is effective. Take Jim Furyk for example, his swing is very upright and vertical due the fact the he starts so close to the ball. During his transition however, you see him loop the club quite drastically back inside to get back on plane. Follow this link to see a SwingVision video of Jim Furyk’s golf swing. 

So when it comes to teaching students, most instructor steer their students away from swings that are unusual but effective to avoid these necessary adjustments. Simplicity creates an easily repeatable swing. This is the exact reason you see many similar, “ideal” swings on the tours nowadays.

Harvey Penick once said “If you have a bad grip, you don’t want a good swing”… he continued to say that if you ever spot a tournament player with bad grip and bad golf swing, then beware, they have had the time to groove their faults and know how to score.

Just some food for thought...