The crash in Mexico was due because he wanted to take more safely a corner. So he was trying to "take it easy" but he's not used to it. I agree with you though. if you pretend for the crown you must adapt more quickly to the car, to the events without struggling with the setup everytime and so on.
I didn't expect Latvala to win the title this year honestly but I expected for sure for Ogier to be harder. Very disappointing.