I forgave the handwavery in the ending because I loved the rest of the movie so much. I loved that they left Rapunzel with her "traditional" ditziness. I'm not sure if she was a ditz from inception or she simply evolved that way, but her naivete was, I believe, symbolic. But in this version, despite her ditziness, she never stopped trying. Even when she was scared or doubting, she tried. And, once again, Disney had the princess save herself (for the most part) in the end. I like this trend. :)