Sounds good if you've got giant pockets or wear a jacket all the time. I've never owned a pair of pants with pockets big enough to hold a gun AND my hand wrapped around it. Now that I wear jeans almost exclusively, that's even more true. And around here, I need a jacket maybe 10% of the year. I've also never figured out how to efficiently draw from my right pocket with my left hand.When I used to carry a 649 Bodyguard in a raincoat outer pocket, worn over a sport coat in cold/wet weather, I could easily have my hand on the gun without anyone realizing I was doing something other than keeping my hands warm. Much faster than trying to get at my primary weapon. Fortunately, I never had to perforate my raincoat pocket.
Being able to surreptitiously grasp a pocket-holstered weapon is an advantage not typically available with other carry methods. Obviously, the constraints of the pocket mean even greater attention must be given to avoiding having your trigger finger be caused to enter the trigger guard or touch the trigger while drawing from the pocket, and especially while clearing the pocket mouth. This is also where the weight and length of trigger pull of a DA/DAO revolver's trigger might be an extra bit of prudence if things get fast and fuzzy.