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If a drive side crank is more aerodynamic, why not put a chainring on both sides.
It's not as simple as that. The drag difference occurs when there's a cross wind, and it's the drag of the whole bike which is slightly lower if the wind is coming from the one side compared with it coming from the other at the same speed. If having a second chainring adds drag when there's no crosswind, then that could easily outweigh the benefit of having made the crosswind drag symmetrical, and the interference between the two chainrings might even increase the absolute drag in crosswinds even while making it symmetrical.
gbj_tester
Jaap
If a drive side crank is more aerodynamic, why not put a chainring on both sides..