The reason ?-- simple , when you look at what the non latino community has done to "their" dances and rhythms, they dont even recognise it any more !!. Spend some time in authentic latin clubs , and you will readily see ( and hear ) why they so dislike the " ballroom " scene .
As I have stated in the past, when the english teachers imported the latin rhythms to the " colonies ", what did they do ?-- change everything to suit their needs ! - ( can someone tell me, why oh why , would you change Bolero ? ) . We know all the musical reasons that are given, going from danzon ( 2/4 ) to 4/4 time, for e.g. , but that does not hold water .The smouldering version of Bolero, for me, bares no comparison .
We also know that times, and music, bring about change, but that is not an exscuse to depart so far from original concepts , that the dances , morph into a different animal .