[thejeff]

This discussion started with the assumption of infinitely quickly growing grass. I assumed from that the laws of physics were up for grabs.

If you're saying that you can't have perfection under our existing physical laws, then sure, I agree. And if you want humans in it, then it certainly won't be perfect.

But much of the discussion has been over whether such a perfect world is even conceptually possible. Whether the concept has meaning. That discussion doesn't need to be constrained by physical realities.