Would it know? What sort of reference could it possibly have?

We already have a similar problem in medicine where people experience pain differently, so it’s hard for people to verbalize and quantify. If you had no frame of reference at all, how would you know that life isn’t supposed to be painful?

You can even view it from the opposite way. What if by removing pain you remove any good feeling it has? There can’t be light without the dark kind of thing.

Some interesting philosophical questions.