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Well said. Winning the GC means you have to be competent on all terrain.
I don't mind a cobble or a gravel stage to spice things up...I mean that gravel stage was one of the best races this whole season. 
But I can also understand why especially some gc teams hate diverse terrain.  Vingegard almost lost that one tour on the mini Rubaix stage.  Imagine the squeaking if that happened.