Board Thread:Speculation House/@comment-25479664-20160418125948/@comment-26018514-20160419065151

keep in mind the CCT was supposedly a gift, not a military resource. It was likely not meant to be depended upon as much as it is... much less forever.

as for fuels, they probably know about many of them, we know they have a grasp on electricity(because electric dust needs to act on something), I believe gunpowder is used occaisionally as a proppelant, but rarely.

You need to realize how science was discovered and how grimm likely changed Remnants technological evolution, inefficient results just wouldn't be pursued as often as we can on earth.