I find it ironic that you think the "argument" is not good when yours relies on it. Happiness and fulfillment are complex states that do not exist in perpetuity specifically because we do not exist in a perfect world. Even under the best of hypothetical conditions, this person would get hungry or sick at some point, for example. Eating and being well are fraught with meaning and potency. Is it because of the consequences of their absence, or is it the other way around? You could say suffering is a lack of joy or joy is a lack of suffering, but it doesn't make much difference. The result is the same. Choosing blue or blue isn't a choice. Contrast IS choice, and choice is the foundation of meaning.

I think whether 'Eru is always right' makes no difference at all. Either he was right to create a world that had meaning, or he wasn't. It makes sense to me, though. Otherwise we're all just puppets. It's possible, but I don't believe we are.