In the early Star Wars movies, the Force was this amazing any mysterious thing. There's the amazing line from Vader and then later there is Yoda with "Wars do not make one great." It's made very clear that the Force is not about combat powers. Both Vader and Yoda clearly believe that all this stuff with lightsabers and telekinesis are only trivial side details to the true significance of the Force. Sadly, since then it has become all about being able to hack through hordes of enemies with a lightsaber. In a way, I think this is a pretty clear case of the writers hinting at something amazing and keeping it deliberately vague to maintain the mystery and understanding that it would be impossible to come up with a specific explanation that would be able to provide a satisfying payoff for that promise. The monster is always more scary when it's mostly hidden in the shadows. It's the few small bits that are visible that are enough to start the imagination and lead to a personal expectations of something amazing even when you have no specific idea what you expect would be there if you can see it. Same thing with mysteries. But I think the implication here is that the full power of the Force lies in the abilities of precognition and telepathy. Even if it is impossible to come up with anything amazing enough to fully satisfy the expectations of that incredible mystic power, how could these initial hints be at least somewhat expanded? In what ways could these powers of seeeing different places and possible futures, and being able to sense and maipulate minds take on much more dramatic roles in a story. Even if it would be hard to come up with anything that makes the destruction of a planet look insignificant.