I am in severe disagreement of this, since it does not calculate the effect of running the website on the device. It seems that the author has forgotten the impact of an autoplaying video on phones or laptops, or the execution of JS in the browser, or worse using GPU just for rendering your "pixel-perfect" news website without reason (which by the way I've encountered nearly every day). If it is a website that is visited very rarely, sure, pass. But even with 100 visitors every day, it does start to trickle down.