In a way that I alluded to in the article on Challenge players can often have a tendency to limit their own enjoyment of a game unintentionally. I talked a bit about the concept of grinding in an RPG, a fundamentally intrinsically unenjoyable activity. However, by presenting players with a challenge, you are asking them to use the tools available to overcome it, and grinding is guaranteed to work (i.e a perfect strategy!). As designers, we need to encourage them to play in the way that we predict will be the most enjoyable (and in fact, this may be the primary role of a game designer).
Another classic example of this phenomenon is the prevalence of obviously sub-optimal decks/cards/strategies in CCGs (collectible card games). Sometimes the argument is made that players would have more fun if they didn’t stick to “meta” deck, card or strategic choices. There is a fundamental tension here between what the game is asking you to do (win) and what will result in the most enjoyment (having unique play experiences and learning).
Hearthstone statistics might tell me to play mid-range shaman. Is it the most fun way to play? Is playing the same deck over and over the most fun way to play?
Wherever possible, we should acknowledge that this disconnect between pursuing the goal of the game and pursuing value from the game is undesirable. We should attempt to create harmony between these two aspects of a game by trying to maximize the extent to which the most fun way to play is also the most strategic.