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)
GL should always work for the simple case, but instead you need to rewrite to avoid bugs in its many layers. And once you have Vulkan/Metal, industry-specific wrappers are better than the impossible to debug procedural GL junk.