I think they are discussing landscape because there is a tendency to force tablet layouts onto mobile users. That and advertisers want the most real estate for

I think they are discussing landscape because there is a tendency to force tablet layouts onto mobile users. That and advertisers want the most real estate for their videos. Visibility be damned if you have to type anything on one of those sites. Keyboard covering the rest of the screen real estate not consumed by dickbars (sorry, I never heard that but it's such an apt description).