[ASalazarMX]

This assumes humans are interesting NPCs. I feel like we're the bizarre comic relief planet for the really interesting players to have the space adventure of the day.

I understand your point, though, but even if it was true, keeping track of all the physics in the Universe's filler would demand more processing power than what is needed for our planet. The speed of light would be our rendering depth, and that's still an unthinkable amount of computing, copy-paste included.