When you stop and consider each of them, the Force itself represents the core theme in each movie, and acts an in-universe manifestation of the will of the plot. It’s inevitable due to how the monomyth structure works, which I suspect would have appealed to George Lucas as an ardent supporter of the monomyth.
It’s why I love Han’s “That’s not how the Force works!” when Finn is talking about miraculously sneaking onto Starkiller Base without a plan. Because it’s actually exactly how the Force works.