It's cute for a theme park show, for sure. The Let It Go staging works for that space. The Olaf puppet is adorable.
The Broadway version is obviously going to aim for something bigger. It also, at most, needs to run two times in one day, rather than a theme park show that runs a whole lot more than that. I could see them going in that direction for Let It Go, but Elsa's choreography will have more actual set pieces pop up from the stage and fly in.
Love is an Open Door as a reprise/finale makes sense, just because it offers that happily ever after moment for the characters. It's catchy, too.