It erases the Santa commercialism, it gives Santa 'Klaus' depth and reflection. It makes him human, and not just a gift giving robot. As my nieces get older, and as I got older as a kid, my mom told me Santa was the 'Spirit' of the man who made toys for children long ago, poor village kids or a local orphanage. The story changes based on culture a little bit. But in the end my mother would tell me as I got older and the other kids made fun of me for believing in Santa, that Santa was the 'Spirit' of the man, and that he can help with a 'wish' if you have one. Which extends the Christmas story of Santa Claus, just like the ending of the movie, it felt so connective to my own moms story, how the postman gets to see his friend once a year, even though his friend has departed, or 'faded' away. I adored Klaus the moment he was introduced in the film. A man who loved his wife, cherished a love they shared, he wanted a family with her, built her a house out in the woods that she loved, he built bird houses because she loved birds. He then gets to live and experience a beautiful part of his and his departed wife's dream of having children, and the happiness that children naturally exhibit in simple things like 'play'. It was a beautiful movie <3