It works in KSP because your a launching from the equator into a zero-incline orbit. In the real world, or modded ksp, the advantages of on-orbit refuel are ve

It works in KSP because your a launching from the equator into a zero-incline orbit. In the real world, or modded ksp, the advantages of on-orbit refuel are very difficult to realize. It is basically only practical for geostationary sats. Everything else, everything inclined, would cost more fuel to get to than simply launching a new refueler for every task.