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@Fox
No, it's not. I agree with everything else you said, but I'm not wrong.
There are proven benefits to shorter or longer cranks. People may make the choice on an arbitrary basis (arbitrary meaning based on random choice or personal whim, rather than any reason or system) but I'm not for my new road bike because I prefer spinning, so it's 165mm for me.
This is based on reasoning from the evidence available (various studies into the effects of crank length, which all come to the same conclusion).
So no, it's not arbitrary at all.