Originally Posted by Malk
If I understood correctly, you're saying it's best if either the game is really close to the artistic vision or if it's as far away from it as possible? Doesn't make much sense to me.
Hard difficulty should play exactly like how the developers intended their game to play ("closest as possible to their artistic vision"). So, if you want to experience it the way it was meant to be, choose hard. But, if that's too hard for someone, I don't see a problem in letting that individual to change the difficulty.
I'm no programmer, but it doesn't sound too hard. Just make the smartest AI you can, name that "hard" level of difficulty, then take away some of the its tactics and call that "normal".
I understand your point of view, but I (and I'm probably in a majority) don't really like to challenge myself. I do, however, like to be challenged, so I'm all for predefined difficulty levels.