I know all this yet, way back when, and I mean decades ago, I mentioned to a knowledgeable old boy that I carried my sixguns (they were S&Ws) with no round under the hammer, 1800s style, and he said they will NOT go off if dropped, that the trigger MUST be pulled, and he proceeded to demonstrate by banging a loaded revolver on a table (not the safest thing ever, I assure you; I didn't like the demo one bit but for the result!) to prove it would not fire.
So I presume cost saving, not safety, is the key.
***GRJ***