NMS definitely suffered for years from having a procedural generation system that created a lot of stuff with nothing to do, though I hear they've done a lot since then through extensive updates.My understanding is a bit of both. They are simulating a galaxy for folks to explore, and also want interesting gameplay.
I'm not familiar with the game. Is the point of the generator to make realistic planets, using data from observations, or is it to make a variety of worlds that will lead to interesting gameplay?
Thanks. Buy my books! ;-)"Evoke setting through its own procedures" is a great phrase.