That should have said “as qualitatively different and intrinsically good as fun?”
“Heaven is being perfect.”: Even a circle can’t be perfect, in the classical sense of being the best possible circle. Is a circle of 2cm radius better than a circle of 1cm radius? It is much more nonsensical to talk of a person being perfect. It is even more nonsensical to talk of a still-evolving species being perfect.
What’s most interesting to me is that lizards don’t have fun.
Maybe they have fun. But if they do, I’m pretty sure worms don’t have fun. A discussion like this one, carried on by lizards (or worms), wouldn’t have included the concept “fun”.
And if you keep going back in time or down in size, I’m sure you’ll find organisms that don’t experience pleasure.
Are there other types of possible experiences as qualitatively different and intrinsically good? Are there infinitely many of them? Is charting the course based on “fun theory” like lizards charting the course of the future based on “basking on a hot rock theory”?
Probably. And if the set of organisms that experience pleasure is a proper subset of the set of organisms that experience fun, then the answer is even more likely to be yes.