By prophetic vision, I mean that the Jedi potentially have the ability to sense galaxy-changing events before they happen. Presumably, a proactive Luke Skywalker who foresaw the Starkiller weapon and its effects would have mobilized such a Republic response that the First Order would have stood no chance against the Republic. And actually, it is implied that he did foresee this in the TLJ flashbacks but it led him into exile instead of saving the Republic. I think that if I was able to suggest that these visions of the future are the reason the Jedi are so powerful, it would make a lot more sense than simply saying that Luke can lift a whole lot of rocks and Snoke should build a giant planet-destroying weapon in response.

I have some ideas for editing the prequels, but they suffer from so many intractable problems that I doubt that any fanedit could make them more than mediocre movies.