Reply #4: Gun manufacturers now make magazine disconectors for this exact reason.

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When magazine is removed a lever drops which engages the internal safety. I don't think they serve a legitimate purpose but it does help to shield them from lawsuits (like writing warning HOT on a cup of HOT coffee).

I bought an M&P before I realized it has a magazine disconnector. I manually disabled it, pretty easy to do. I don't mind it being an option but I wasn't aware they exist and it wasn't clearly marked. Given the choice I would chose a weapon without any useless junk like magazine disconnector or internal locks.

Two reaons:
One when I pull the trigger I want the gun to fire, my safety is between my ears.
Two I figure it is just one more thing that can break at the worst possible time.

Can you imagine using a gun in self defense and it goes <click> because somehow the magazine disconector has jammed and the weapon "thinks" there is no magazine. Or you and perp wrestle for the gun and someone hits magazine release, you get control of the weapon and <click> <click> it just because a useless club until you find and re-insert the magazine.