Text is displayed on the movie screen all the time, so I'm unclear what your argument is here. Yes zoom the whole thing, as apposed to zooming only the text and

Text is displayed on the movie screen all the time, so I'm unclear what your argument is here. Yes zoom the whole thing, as apposed to zooming only the text and then changing the layout to accommodate. As a user I do this all the time in browsers, in video games, and even in display settings. It works great, because everything stays locked together, and there are never any unanticipated interactions between elements. The absolute worst case scenario is the aspect ratio doesn't fit the device perfectly. You know what doesn't work great? When I resize my browser window and the responsive designed threshold decides my 3k monitor is a phone. So much engineering effort to achieve a bad user experience, when zooming the entire UI is superior in every way. Just use pixels, they are unambiguous units that are consistent across all digital media, scaleable without changing layout, and understood by both designer and user alike.