Have any studies been done on how orbital refueling for deorbit would impact designs of RLVs including SSTOs/spaceplanes and make them practical? I'm no aerospace engineer, but my understanding is if such a vehicle doesn't need to carry its own fuel for deorbit, exotic and incredibly expensive technologies and materials don't need to be developed and incorporated into the design to save every last pound of weight. For example, why bother with expensive and experimental scramjets to save carrying oxidizer or ultralight carbon/epoxy cryogenic hydrogen tanks if an RLV can just tank up again on orbit? I imagine the carrying capacity of the RLV, whether payload or humans, could also be increased, perhaps significantly, while the use of cheaper, simpler and off-the-shelf components would lower R&D costs and make the vehicle more reliable overall. Comments? Links? References?