After all, if God meant us to use two hands, they'd be called handsguns.
Depends on what you mean by "one handed."
If by "one handed" you mean casually slinging the pistol around while talking to friends and trying to not spill the open beer in your other hand, then I'd say that is reckless.
Canting it also (while admittedly reducing accuracy slightly) sends the brass towards the ground, in the case of a few pistols notorious for sending it back at your head.
I agree, but that is not always a possibility at many ranges. Many RSOs would wet themselves at the sight of someone laying down and firing between their legs.While we should practice shooting one-handed, we should also practice shooting lying down, standing on one leg, and in other unusual positions.