It has nothing to do with different capabilities it has to do with installed base size and habits. E.g. inside our cars there is an engine which is just a refinement of the original one build at the end of ther 19th century. Real changes, like turbines, hydrogen, electric propulsion are still little more than curiosities. The rockets which are launched today are little more than refinements of von Braun's V2. Apart from the Pegasus, there are no working air launch systems and VASIMIRs have not yet flown.

Even if the Genesis thing provided strategic advantages over V4, it would still have to combat the installed base, user investments and user habits.

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