Because .38 has much less recoil!
My statement was for general steel use philosophy.
I've never used D2 nor have I been asked to. I have some S30V, but I cant remember if I've used any.
I had a client recently ask for one of my push daggers in CPM3V. It's a cool steel that he was familiar with from a high end factory folder. I explained that the dagger is 1/4" thick and about 4" long and that I could make it out of any stainless alloy and the differences would likely never be discernible. The shortest bar I could get of the appropriate dimensions was 18" and it cost $145. We settled on CPM154 for his knife.