I heavily disliked this change at first, but I'm coming around to like it. The implications, the reactions and the interactions will be too good to dislike it (rofl)
Yeah, but it's really stupid, if you really think about it.
Out of curiosity, why is it really stupid?
I mean, the idea that a 'fake' Arya marries Ramsay and Jon sends Mance Rayder in disguise to save her after he was glamoured to look like Rattleshirt seems pretty 'stupid', imo. I don't see how getting rid of fake Arya and using the real Sansa is stupid- she's the heir with all of the sons 'dead', and it strengthens the Bolton's position immeasurably. It's smart.
Then repeat to yourself 'It's just a show, I should really just relax.'