Some of us, especially those of us that live down south, find it difficult to conceal a handgun in summer clothes. I wear khaki shorts most of the time, and it is hard to hide a real pistol. Therefore, I sometimes only carry a small pistol.
The first really small pistol I carried was a Keltec P-32 in .32 ACP. It was small enough to fit in my pocket, but was chambered for a pretty weak round.
The next year at the SHOT Show, my old buddy Tman told the folks at Keltec that they ought to chamber the pistol in .380 Automatic. The salesman told him it couldn’t be done, and Tman argued with him about it for a while. But the next year, they did just that and announced the P-3AT in .380. Of course, Tman took full credit for the idea.