Reading assembly is not really easy, especially in the context of video games using proprietary GPU I/O, it might as well be obfuscated because there is no way

Reading assembly is not really easy, especially in the context of video games using proprietary GPU I/O, it might as well be obfuscated because there is no way you're figuring out how Frostbite handles bullet drop from a page of x86 instructions. Maybe if you're willing to spend years reverse engineering game engines, you can start to form patterns in your head, but even then we're talking about niche specialties inside niche specialties. In no way is it accessible to an average software developer, unlike source code which most developers can read and understand after a few dozen hours.