Interesting argument. In fact if the fault would lie only between screen and the 'last mile' on the GPU you would be correct. But GPUs are slightly more than s

Interesting argument. In fact if the fault would lie only between screen and the 'last mile' on the GPU you would be correct. But GPUs are slightly more than simple display renderers (at least nowadays), so (vast simplification) multiple renderings happen before the actual display output is generated and sent over the wire to the display. E.g. a failing memory on the GPU might only corrupt the output of a single window/application, since this window is using the GPU to render content, while everything else is fine.