alt Hacker NewsIt was useful for paper because it helped save time in cutting, folding, printing etc. None of that matters for a phone.
This is such a non issue given that iOS developers already have so many resolutions to test.
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Proportions absolutely matter for displays, both for aesthetic comfort and for efficient scaling. Most of the world uses ISO216 and its pleasing 1:sqrt(2) proportions. Leveraging aspect ratios with wide acceptance is a win both psychologically and for graphic designers.
Our world is full of artifacts from a previous ages and using some of those as standards is useful/convenient.
We still use QWERTY keyboards even though our highly futuristic typewriters don't jam anymore. We type commands on tty teleTypeWriter, we save files with buttons using a floppy disk icon, etc etc.
> None of that matters for a phone.
Of course it does. They show the most basic example right on the page, which is that you can side-by-side full screen apps.