I'm not sure I agree with the claim, but even if we take a full rewrite at face value, "every major graphics vendor" for desktop applications is NVIDIA and AMD/

I'm not sure I agree with the claim, but even if we take a full rewrite at face value, "every major graphics vendor" for desktop applications is NVIDIA and AMD/ATI. On mobiles, you're probably using Unity or similar middleware and therefore not thinking about bare metal (no pun intended)