From what I can tell, because Larian's vision of the game is different than the vision of the game he's created in his own head.
Well I guess it could be argued that Larian is exchanging one set of tyrants for another. Instead of a publisher making demands, it's the backers.
But, the developers aren't really answerable to the fans in the same rigid sense they would be a publisher. I don't see Larian getting pushed around by the kickstarter backers. They have a long history of changing things based on fan input, but abandoning the integrity of the whole game? Nah.
