There's something I don't understand. I've been hearing about "responsive web design" for years, that you should make sure your websites work well on mobile pho

There's something I don't understand. I've been hearing about "responsive web design" for years, that you should make sure your websites work well on mobile phones, because they are the majority of the traffic. I know that doesn't mean that the majority of phone usage is spent on the web, but still, mobile users use the web, and they use it a lot.