I agree, but that doesn't make it any less valuable of a metric. Nvidia cards are extremely widespread, reporting the performance on Nvidia hardware does a good job of representing what a lot of people will experience.

Furthermore, Nvidia made inroads for Wayland support years ago, GNOME just refused to adopt it. Nvidia's terms were always that Wayland implimentations could adopt EGLstreams whenever they wanted, and that GBM would not be considered an acceptable alternative until it was faster. Their so-called hostility towards the Linux desktop mostly amounts to not contributing to GNOME and making their drivers proprietary for so long. In that sense, they're about as evil as webkit contributors who don't fix x86-linux bugs.