to clarify, I agree that the drop safety involves the gun not firing unless the trigger is moved regardless of what force causes it to move, I disagree that the hinged trigger has any role in preventing the trigger from moved with the exception of the drawstring issue mentioned above. In that case, saying that the hinge has anything to do with whether or not the pistol will fire when dropped just isn't accurate. Kahr's have drop safeties that work much the same as the M&P and the trigger itself is one piece with nothing fancy about it.
You are nuts if you think S&W doesn't know this. If this issue had any actual impact on safety, taking this soft safety notice approach instead of a hard recall would open them up to far more liability than just keeping their mouth shut would have.
And for those who don't believe me and who have steam shooting out of their ears over my irresponsibility, I checked as soon as I saw the notice, everything is working just fine