Almost all WWII aircraft had variable pitch props. Some were two position and others had wider range of pitch controllable by the pilot. Hamilton Standard was a major supplier of US props, using a design by Frank Caldwell, who developed his hydraulic design in 1929.
We don't have true prop pitch control, just like we don't have mixture control, cowl flaps and some other functions. If we did, are we also going to introduce engine failures from pilot error in using these controls?
It isn't a sensitive issue. There are trade-offs in the game (it is not a simulator) that are conscious decisions to make the game more fun and not bog the player down in engine and other control functions. There are no random incidents of mechanical, electrical or weapon failures. There is no need to cage gyros before aerobatic maneuvers or to switch on blowers, heaters for the gunsights or gun heaters to reduce high altitude gun failures.