Double wishbone changes dynamically less camber and toe, that's gain .. even if one was to ignore higher production cost, but more space needed may hit in many cases and not be an option. For example, for cars like twins, due wide boxer engine, even with mcpherson struts there is not much steering angle. Or i heard that one of reasons S2K is underbraked due double wishbone suspension. Everything is compromise, and some may not be best for each and every case. Then there is bit of "many ways to skin the cat". At the end we value car as a whole, as package, and there might be cases where end result of whole car is better even if some of parts are not of theoretically best design.
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