What if the Earth system is more complex than a reptile brain? Couldn't it be then comparably functional as well?
No. Because the structures are completely different. And there's been no evidence to date at all that the Earth is anything other than a physical system, which has been frozen, attacked by space by debris, left to cook on a high heat and is currently in a semi-stable transition state.
An intentional Earth would look everso slightly different, I think.
Suggesting that the Earth is having earthquakes because we've been bad says a lot more about how narrative logic works than it does about the Earth.
