There is a reason basically nobody ever uses a balloon, it just does not make sense. It does get you far to little for not enough. You don't save that much ener

There is a reason basically nobody ever uses a balloon, it just does not make sense. It does get you far to little for not enough. You don't save that much energy and you have way harder time starting. You can't do deep cryo fuels and you can't do static fires in lunch conditions.