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
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