I don't know if I can add anything meaningful. Some time back, When IPSC was gaming traction, SAFARI I believe, introduced a holster configuration that included drop from the belt and the barrel canted forward. A design that has carried forward in the Auto Pistol games as well as in CAS. I started a "thing" when I started shooting Gunfighter with two cross draw holster backward, to give forward barrel can't and much smoother draw. Almost immediately, EVERYBODY started to copy it. It works extremely well.
I found in a law enforcement setting, that forward barrel angle doesn't work well at all. The FBI angle works well in a car. The best from a car is a cross draw. I digress.
I personally quit Wild Bunch when it became CAS with a 1911 and no longer let me shoot Gunfighter. Most of the current build of Wild Bunch holsters I have seen, all emulate the "FBI" angle. Certainly it's legal.