If it was responsive, all they would be doing is "hiding or relocating stuff", but the size (in KB) of each page would be the same for mobile and desktop. That

If it was responsive, all they would be doing is "hiding or relocating stuff", but the size (in KB) of each page would be the same for mobile and desktop. That would make it unusable on a mobile. They NEEDED to do different pages for each, and make it much lighter for mobile.