I wouldn’t be “happy enough” if we ended up in flatworm utopia
You would, presumably, be quite happy compared to “various deliberately-bad-to-both worlds”.
I’m not going to stop trying to improve the world just because the flatworm prefers the status quo
Because you don’t care about the flatworm and the flatworm is not perceived by you as having much bargaining power for you to bend to its preferences.
In addition, your model rules out more fine-grained ideas like “the cubic mile of terrain around the flatworm remains unchanged while I get the rest of the universe”. Which is plausibly what CEV would result in: everyone gets their own safe garden, with the only concession the knowledge that everyone else’s safe gardens also exist.
You would, presumably, be quite happy compared to “various deliberately-bad-to-both worlds”.
Because you don’t care about the flatworm and the flatworm is not perceived by you as having much bargaining power for you to bend to its preferences.
In addition, your model rules out more fine-grained ideas like “the cubic mile of terrain around the flatworm remains unchanged while I get the rest of the universe”. Which is plausibly what CEV would result in: everyone gets their own safe garden, with the only concession the knowledge that everyone else’s safe gardens also exist.