Then that's your problem, if you can't understand it. A man is unhappy: he knows not why he is unhappy, what problem he has, nor how to solve it. Is it nonsense to say he is unhappy? A species is wandering around configuration-space; it knows not what the current fitness function is, nor what mutations would solve it best. Is it nonsense to say that the species will do better or worse?
And what definition would that be? Could someone please enlighten me because I have no idea where this comes from.
If the problem is unknown, then what are you working on?
If the solution is unknown, then figure it out (at least conceptually) before you start coding.
Am I missing something? This makes no sense to me.