The problem is Dark Energy devolved into a Soft Sci-Fi type deal. How does it work? It just does, its sorta of that Sci-Fi type thing thats says it just works. While we could go ahead and base Dark Energy on what little science there is, we have to destroy a lot of already created cannon. Anti-Matter is still used however, even by the Triarians, and the Equestrians. Its just that im to lazy to think of what they use it for besides the FFPCs.