Computer evaluation would cut off all the "human" factors involving in a match, especially championship one. It is part of any sport that being slightly better is not enough, you have to be able to turn that into concrete advantage over the scores. To put it another way, "match strategy" is part of the game.

We know with reasonable certainty that Carlsen is the stronger player, thanks to the rating system. Championship match has always be about more than being _just_ the stronger player.