Great points gents, and I thank you for the discussion points. Some guys have brought up SWAT, but what I am really trying to focus on is Patrol. My SWAT belt and my patrol belt have the pistol mags in the same place, more or less, and when I can shoot matches its obviously in a similar location too.
MY issues with the mags on the vest are as follows:
It is faster for me to carry the magazines on my weak side, at around the hip bone on the belt.
I can still reach my magazine pouch with the strong hand if the weak side arm goes down.
Adding pouches for 2 if not 3 pistol magazines takes up valuable real estate, when you add in bodycam, flashlight, pens, cuff keys, note pad, cuffs (or two), OC, Taser (which due to the mounting system and drawstroke takes a massive amount of real estate), radio, etc etc.
In addition to the real estate taken up, when placing the mags centerline or trying to stack them on other pouches, this can rapidly start to add bulk outwards. I have even gone the other way with my Entry Vest, and placing my mags and radio under the armpit.
Along with the bulk, this can get dicey when going over obstacles. The mags (and let's be honest everything else) can get stuck in a chain link fence or whatever, but then you also have a weird top heavy balance with all the weight north of your belt line.