Hi, Matthias. I'm not sure about it either, but one situation where learners or users might miss it is when they want to share their work. If their code follows the design principles HtDP teaches, the world rendering will rely on a single point of control, say the width and/or height of the scene. But those are ultimately bound to the particular size of the computer screen on which they coded. On the other hand, if they were able to set the relative display size as point of control, well written code will behave well on many different screens, while not so good code would be penalized when shared. Just a point to speak in favor of the inclusion, but there might be more solid reasons to reject it.
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