The only thing worse than a gun that requires your trigger finger to sweep the trigger guard to unload it, would be to have 4 pistols with different releases...
Picture a dynamic situation where you're reloading a gun with a mag release button, and attempt to drop the mag, with one still in the chamber.
Sh!t happens, and hitting a release that is not there(imagining that you're shooting an hk when you're shooting a m&p) could possibly result in a trigger press. Not 100% guaranteed, but likely enough for me to avoid just like the Serpa.
I like my trigger finger to do one thing when it's on the side of a gun, and one thing only. Using your thumb on the guard release is another option, but it's still too close to the the trigger for me.
I'm sure jeffcarr88 is an ultimate operator and would never make a mistake, but a simple gun enthusiast such as myself, likes to keep it simple for maximum efficiency under stress.
For most, that will be in one ear and right out the other.
For anyone interested in that concept, source some info on "Hick's Law" and the "OODA Loop".
Very interesting stuff that explains our minds in all situations, not only when it comes to manipulating guns.