I tried answering, maybe something to do with being right handed etc. but nothing really made much sense. So why did we achieve such consistency in bicycle design, while we struggle with other things (metric Vs Imperial, left hand Vs right hand drive cars)?
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There really is no point to having both (outside of specific instances where they do make them). Its easier if all the machinery is designed for it to be on the same side, then you dont need to have parts for left and right. Its also easier and cheaper for all companies to agree to the same side, because then you can sell parts to everyone that will work with their current bike.
Let me ask you this: What would the benefit of having both sides available (again in mass quantities, as there are outliers)
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