Does that not assume that the mitochondrial from both parents are treated equally in terms of inheritance? It seems to me that biological systems do not tend to

Does that not assume that the mitochondrial from both parents are treated equally in terms of inheritance? It seems to me that biological systems do not tend to use random chance most of the times if there is a evolutionary benefit, thus if there is such benefit I would predict that those "tens" would be treated differently from those hundreds of thousands.