Sorry to disillusion all you Moe fans - and of course one would never disrespect the greatest ball-striker ever.
However, his swing was extremely subjective - it worked wonders for him especially when hitting tons of balls on a range, because he had grooved it in through years of repeating it. What happens under pressure, when muscle physiology changes and timing is messed-up?
The golf swing has had very little peer-reviewed research published on it. Only 3 principles have been proven in science, the rest has all been devised subjectively over time, based on how the best golfers do it. Doctors practice 'evidence-based medicine' to get the best results. Swing doctors? Merely practice 'trial and error', not because they're bad teachers but because the golf swing as a whole has not been researched much.
So, forget MGS for now. Know that it is very important, because it is the body which swings the club, to understand how the body works. Why do we not play football kicking the ball behind us (the human leg does not move backwards as easily as forwards). Or, my favorite example - why does a horse kick backwards and a cow forwards. All these creatures have JOINTS, which can only move in a very fixed manner.
SO, if every golf swing fault is fixed ONLY by how best to place the joints so that they can deliver the club to the ball correctly, and with NO rerouting, how can such a swing fail?
In fact, that is also the reason why the MGS has less chance for causing injury - the joints are placed according to their optimal working requirements, and unbend and untwist within the scope of their design.
So, even if improvements are made to the MGS, which is very likely, the idea is to place all body joints into ideal working positions based upon their DESIGN. No-one has ever considered that a joint cannot do anything you want it to.