There is something about their profile that makes them easier to pocket carry. Which I would still do if I hadn't lost mine in that unfortunate boating accident.
A ruger LCP (.380) with a squared off rigid pocket holster doesn’t imprint the gun shape at all—looks like a small wallet, at most—and the slim semi-auto shape makes it easy to draw. A wheelgun, even with short barrel, tends to be bulky in the pocket, in my experience.