Yes, the late late war hardshell holsters are less common than the "softshell" P.38 holsters. I opine that the production time for a softshell was shorter, including not just the material shaping but also the number of parts, the time to train labor, and the amount of labor used. There is a unique metal fitting riveted to the front of the hardshell version that is not required on the softshell version. Training to produce a softshell could result in ability to construct P.38, Astra 600, and generic 9mm pistol holsters. Training to produce a hardshell applied only to P.38 holsters once P.39 holsters were no longer produced (I believe this ended in 1940). You could produce a softshell about anywhere with fewer tools and fixtures, but not a hardshell.
The softshells probably had a shorter expected service life but the benefits outweighed the costs.
The softshells probably had a shorter expected service life but the benefits outweighed the costs.