A lowering of the head due to axis tilt is ok, IMO, provided you got some lag. Otherwise one might break a wrist plowing the club into the ground.
Somehow I don't think the game is riddled with 10 handicappers who have messed themselves up perfecting Tigers squat. Or Sneads.
Like I said I think Tigers squat maybe excessive, but there is no doubt that using the ground and "sitting" into your left side to some degree is A MOVE done by better golfers.
Day 2 of working on this move and Im still seeing better compression on the ball w/about a 2 yard fade. But this is golf , so talk to me in a month