I think there seems to be a bit of confusion here about “prefabs” (not even sure where that came from, as “prefabs” in the worldbuilder sense are things like trees).
Right now we have a set of world configs, this describes what most of you will recognise as the atmosphere and level of a planet (Fierce ect). Within these configs we have weighting towards different biomes (the higher level the world the more extreme the biomes tend to be), lighting, and the colour pallet. These still carry a massive degree of randomness within them. Each time you build a world with a new seed the variation is staggering. The odds of two rental worlds being even close to the same are teeny tiny atoms in the universe odds.
We are looking into how we can give players some control in picking their worlds, but i would rest assured there isnt going to be 1000 “Lushtopia Prime” clones floating around