I had to edit my original post. But he's says fairy tale not fantasy. My bad.
A prince, princess, a castle, it is a fairy tale trope. And Star Wars is a modern fair tale, with side of operatic tragedy.
JJ concepts are at some points surface level, but other places, especially with TROS deeper. (though that may be from Terrio) The one concept that particularly love, is the relationship between Rey and Ben. As I've mentioned before they have this Yin Yang relationship. They are like living embodiments of the Force. When we look at the symbolism that represents the Force, we see the symbol for the dark and light sides, contain the other within each other. They are intertwined. And we find in TROS, like the Force itself, they are a dyad. Two that are one.
This concept of two that are one is inversion to a concept of duality that's found throughout Star Wars, particularly in TPM. And I love that at the end of TROS, they literally become two that are one. It's interesting thematic twist/inversion to the beginning of the saga.