If Glock came out with a G19 or 19C 'MOS' gun I would gladly open carry it with a RMR. Not sure how well it would ride in a holster concealed, but worth a try.
While there are people who shoot IDPA for practice on carry gear, there are also people who shoot it solely for the competition aspect. While I have no problem with a class devoted to single stack pistols, I dont feel that the G19 size guns should be limited to 8 rounds to 'even the playing field' If you choose to carry a gun that only has 8 rounds, then your at a disadvantage in real life and competition to someone who has 10+ rounds. I understand and see both sides of the issue. Its a ever evolving world and its hard to keep any sport up to the most recent and advanced technology.
IDPA was founded on the base that the shooters ability trumps the 'equipment races' and I would argue that a M or DM would shoot a G 17, 19 or 34 to the same ability as a XDs or a Shield on the distances that IDPA targets are set. Along with the same skill set as draws and reloads. Enough practice and you can reload a Shield just as fast as a ESP gun.
I appreciate what your saying, but disagree ..... if you truly believe that why don't people shoot their G19 instead of the G34, or why make any changes to either and not just shoot them stock? Because the larger frame and longer sight picture make them a lot easier to shoot. Here's the thing and please don't take this personal, you could give Vogel a G34 with 10 round capacity and a G26 with 8 round capacity and have him shoot the same stage and even with his skills he is not shooting the same times, at the very least he's doing another mag change with the G26 which takes time. The clubs I shoot at some times have targets out at 35 yards, so at 35 yards the G19 is no easier then the shield to hit that target with? I get the whole thing about giving yourself every advantage and working the rules, and shooting IDPA for competition. I love competing myself and now with the CCP class I won't be at a disadvantage.