Fractions from superiors/inferiors

Hi! Does anyone know if there are any potential problems with an idea of building the fractions feature by vertically repositioning superiors and inferiors within opentype, meaning without separate dnoms and numrs glyphs?

If I understand it right, dnoms/numrs have no other use nor unicode, so if they happen to be of the same size, it seems to be more reasonable to directly use superiors and inferiors to keep the file smaller. But the conventional approach suggests otherwise. Am I missing something?

I don’t see a problem with it.

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