Yes, but my point is, if they were ever to add more prefabs, any time they did so, it'd mean each planet in the galaxy would update to be completely different to what it looks like in the current version of Odyssey. So any attempt to fix the lack of variety would mean every single planet in the galaxy changing completely YET AGAIN, something that would exacerbate the problems of stuff like racing leagues having to find new courses each time etc.They don't need to sit down and generate all the planets, they'll be generated on the fly on the host's computer. Just need to upload the set of prefabs and chuck them in to the system.
It'd be like all the times my home planet in NMS had its biomes, sky, and weather completely reset with a patch.
So it'd end up with us either being stuck with this repetition we have now, or with it becoming a recurring problem of the galaxy just randomly reshuffling every planet any time they try and lessen that, and us being unable to use any kind of geographical landmarks any more.