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Widening out is dangerous because the legs are made to swing forward and back, so moving against the natural motion creates stress points. Widening out for goaltenders is destructive to the knees, groin, hips, and back because the moves are done explosively and repetitively, tens of thousands of times a year. While giving you better mobility, Overdrive allows you to control your widening out, to reduce it, and often not even to use it by keeping you on your feet.
Left is a video of Jonathan Quick injuring himself on Oct. 13/16. Watch his right leg boot out as he tries to push off from it. This would never have happened with Overdrive. Now LA has serious goalie problems, their season is a big question mark, and a multi-million dollar goalie, the most exciting goalie in the game, is gone. We know his injury history. This is definitely going to knock his game down a notch, permanently.
Jonathan Quick has had back surgery and groin problems, which is no surprise, given his style of play: he compresses low like a coiled spring; he widens out more and more often than any other goalie; and he often does two moves when one would do. His energetic, aggressive, super-wide style places a time limit on his career. You can only play it for so long before it catches up with you. Jimmy Howard had it catch up to him very quickly. He could widen out beautifully at the beginning of his career, but he's been in injury trouble for a while now. A lot of goalies are injuries waiting to happen: Neuvirth, Bobrovsky, Mason, and many more, great goalies who could really widen out nicely. Note that widening-out injuries occur at the weak point of the lower body, the weak link in the chain, which could be groin, knee, back, or points in between. Also remember that injuries tend to spread, so a groin problem easily becomes a back problem.
The boot-out above is bad, but not particularly horrible. Not a whole lot of weight is on his right leg as it boots out, simply because he is on his knees and the left knee is taking a lot of his weight. If he had booted out while on his feet, then all of his weight would have been on his right leg and it would have been ugly. Again, it's an obvious boot-out but not a bad one, and still it causes a serious injury. It's rare that we get such a clear-cut example of the danger of boot-outs, but remember that this is the end of a long process, and most of the damage happened earlier. If any of this is unclear, I'm only repeating what I've said in much more detail elsewhere on this site, always ending with the fact that Overdrive prevents the wear and tear that leads to injuries exactly like this.
As for legality, nothing has changed, but know that Overdrive is not ever going away, at least not until the shape of the foot changes and goalies stop moving laterally.