What about their CPU? And if they don't agree, how would their machines respond?
(This question is half joke half rhetorical. The point of it is to argue that there is no material difference between different parts of a modern computer/smartphone. The CPU and GPU are often the same chip and both are and were always part of showing you a web page. The fact that WebGPU uses a different API doesn't change anything)
That's probably a hard line to draw. Just blending some colors or doing a complex layout isn't strictly needed. How complex can something be be before it's unnecessary?
(This question is half joke half rhetorical. The point of it is to argue that there is no material difference between different parts of a modern computer/smartphone. The CPU and GPU are often the same chip and both are and were always part of showing you a web page. The fact that WebGPU uses a different API doesn't change anything)