The reason you never hear of such issues is because it’s a major misstep by the company (the fire when dropped issue). The “it just went off” is probably an artifact of inexperienced users like police officers (sadly). Similar stories were common when glocks hit the market. The glocks have a tabbed trigger but that wasn’t enough to keep fingers from depressing triggers when unholstering (especially from holsters requiring index finger to depress a button to unlock the gun from the holster).
The old saying was “don’t pull the trigger if you don’t want it to go off.” Now it’s “keep your finger off the trigger unless it’s ok if it goes off.” I suppose the p320 will change this to “don’t let anything touch the trigger, even the side of the trigger, unless you want it to go off.”
M&P is a good choice. I wanted handguns I could manufacture myself so as to avoid the gun free school act of 1994…Did you know you the state can abduct you and hold you against your will for a decade if they catch you existing within 1,000 feet of a school with a firearm used in interstate commerce. The Supreme Court struck down this law as applied to firearms in general but pointed out that the federal government could assign themselves this power if they abused the commerce clause of the constitution by applying the law only to guns used in interstate commerce…which is almost every gun with a serial number. Now I can drive around town without risking prison.