I carry a 938 loaded with BB ammo. While it isn't a comfortable round for practice, it is nice to have 8 rounds of ammo that approach .357 power for a self defense situation.Not that I am doubting the numbers of the Buffalo Bore ammo quoted in the article, it gives both the 9mm and .380 a bit of a lift in the energy department over the average, commonly used SD ammo. Generally speaking, the .380 is good for around 200 fpe, the 9mm in the short barrels is closer to 300 fpe. Try sending a few of those hot loads downrange in a micro-compact pistol, and you might decide for yourself that its just a little on the warm side of comfortable. I have tried BB .380 in my LCP, and have run Winchester +P+ in my wife's PF-9, but only to satisfy my curiosity.
As for pocket carry, I have an LCP, and a J frame that sees occasional pocket duty, and I have given both the PF-9 and Kahr MK-9 a try in pocket duty. The LCP is the most comfortable for me. The 9s are both just a bit bulky for me, though I will admit, even more than a few keys on a key ring in my front pockets are annoying. Fast forward to winter pocket carry, and my J frame becomes a favorite in jacket pocket duty. Its a hammerless, and as such, it would tend to be more reliable in the confines of a pocket over either semi-auto fired from a pocket.
Would I prefer a 9mm over the .380, definitely. Under normal circumstances, I dont pocket carry. But there are always times when "normal" doesnt happen, and .380 in the pocket is better than a .45 or 9mm left at home in the safe...