I think the kiss for the sled was unnecessary because I think it doesn't 'add' to the characters of Anna & K. Instead, it degrades them because of the message: 'You can't marry a man you just met'. This message is repeated more than once. That scene lowers Anna's character because it makes it seem that she didn't learn her lesson. It lower's K's character because he ignores his own advice. Also, the romance felt rushed. Many would argue that K loves Anna deeply when he went back to look for her. However, when Anna froze, he didn't even try to do anything. He just stood there. IMHO, I think he knew that he didn't love her that much and his effort will fail. The look on his face was sad, but it was more like, "Aw, that's a shame" kind of sad when someone gets hurt in an accident. He acts just like the other onlookers. There's sympathy, but no overwhelming grief as a result of losing someone irreplaceable. Elsa on the other hand, is devastated. The one she protected and loved so much that she denied herself for 13 long years was gone. But Anna saved Elsa already, right? The act of True Love was done and Anna should've thawed. I think True Love must be reciprocated. When Elsa finally touches Anna, it's a gentle caress on her cheek. Elsa had been holding back, hiding herself and her feelings. As reality hits her, her grief comes crushing down and she cries as if the entire world was ending. Her tears and grief display how much she loves Anna. Anna starts to thaw only after Elsa openly displays her love for her. Because of the above, I think K-A romance angle is totally unnecessary. It distracts from the main message from the movie. It degrades the characters. It would've been better for Disney to show that girls and boys can just be friends.