I agree with Spats... I would have to say that the logic behind carrying concealed is to carry what is comfortable. While it would be great to be able to carry a full size semi auto with a huge magazine, its not always practical / comfortable.
It also depends on where I'm carrying. This may sound silly but if I'm walking my property (in shorts) and still want to carry concealed, I can carry my G17 and not worry so much about printing (but the pistol is still out of sight anyway).
If I am at Walmart (in shorts), I normally carry my Charter Arms Off Duty, or Ruger LCP. If I am wearing a Carthart jacket or something heavy I can easily conceal my full sized Glock, no problem.
"The philosophy of gun control: Teenagers are roaring through town at 90MPH, where the speed limit is 25. Your solution is to lower the speed limit to 20.”