Ah, now I do understand what you are saying

On the other hand, is it possible to think of a non-random system in which there is no "optimal" food, or "optimal" sequence of food? It might not be a single food item, but there will always be an "optimal" way to train a bile. It might be more complex to achieve, or more difficult to calculate, but won't there always be a cheapest/most efficient way to raise humours? Trying to make it more "fun" or "complex" runs the risk of more frustration, I believe. Pre-patch, this same frustration was there, but we were able to remove the randomness and most of the frustration through grinding.
Of course, I do understand i'm very close to saying "impossible", but that merely means that in my restricted view, it seems to be so.