Fine, let me try to get my point across then.

Why should MOST people take up a powerlifting style? Well, simply put I think that the sport of powerlifting has disected and analyzed the squat in a way that few other sports have (Oly lifting would be a close second but since the squat is not an Oly lift, it is almost always viewed in context of the whole, either a snatch or a C & J.

Now, that being said, powerlifting has prescribed a squat that puts all of your most powerful muscles in play, removes a lot of potential for injury by stressing correct form (though I realize this is only correct in the sense that it meets the standards that WSBB has created). While I think that there is some potential for error and injury, I believe that if coached well, or even if someone were to read and comprehend the instructions (chest high, elbows down, feet wide, start with a hip break, sitting back or "reaching back", shins vertical, spread the floor with your feet, push the knees out, drive the hips through) the true risk for developing some reduced mobility or increased potential for injury are as minimal as they could be.

Do I view all injury as originating from a congenital issue? No, but it certainly seems to me that if you didn't do something stupid, then the other answer always comes back to some genetic characteristic that started the person with a propensity towards injury. In the case of flat feet, I'm not sure that it is congenital so much as years of detraining. Of course there will always be people that are simply built wrong for powerlifting squats, or squatting in general.

The other factors that would have me teach this method FIRST, before moving on to something more complex, like an overhead squat or a front squat, is that the concepts are pretty simple, and you can effectively utilize some additional methodologies like box squatting right off the bat. Most people can maintain a tight lumbar back when learning to squat in the WSBB method (perhaps it is a little general of me to say that all powerlifters use that method). I have found the opposite to be true when using a high bar/front squat. The real reason for this is that most people that I have watched seem to have a lot of lower back rounding once they get too deep into the squat. I believe that Crossfit terms this "a lack of squat maturity" and it is something that goes away with time and practice, but why jump into that when you can start on a squat form that most people will handle more weight with, can maintain proper lower back form with and still gives the same overall desired effect (assuming you are of the "squat big and get big" camp)?

Like I said before, or was trying to point out, I think that most of the idea that powerlifters are immobile comes from watching your typical super heavy lumber around. Chances are that once you are that big and have been working on lockout partials for so long you will start to develop some reduced mobility simply because those guys don't stay stretched out (as a generality) and don't worry about full ROM for the most part. But as I was trying to point out, you see powerlifters with 900+lb squats coming over to strongman, and these guys are agile and atheletic. They have to have a full ROM in order to compete as strongman has even wider ROM than Oly lifting (less focus on speed and form for the most part as pros are sickeningly strong and form is not really a disqualifying factor).

So in an ideal training sequence (if I were training someone, which I have done and still do from time to time) I would start with the powerlifting variations of movements and then turn over to other variations with time. Front squats would be my second choice, or possibly hip squats as that would hit the same muscles without the stress on the back. Nobody can stick with one lift forever, and WSBB guys have keyed in on that pretty well. So of course you would never have someone stick to one lift for the entire length of their lifting career. But the powerlifting squat would be one that I would start with and revisit frequently as a baseline for true strength.