It's nothing special; it's a logical consequence of the question "how would you land a rocket" when you assume the rocket is single-stage and can just travel from world to world, and you're a fiction writer who doesn't understand (or purposely neglects) the rocket equation. I mean, how else would you land a rocket, so it can be blasted off again? (Again, remember this is sci-fi that's very light on the "sci" part, where they're thinking in the future that humans will have self-contained rocket ships that can just travel from world to world without worrying about supporting infrastructure, the rocket equation, having enough fuel, needing to do any maintenance, etc.)