The jian kind of makes sense for Galadriel, but I would certainly argue strongly against the use of cavalry sabers for our elves. They are designed for use against unarmored targets, which is a result of the advent of gunpowder. Marielle, the reason for the shape of a scimitar is specifically to deal with one of the problems I just mentioned. The flare at the end of the blade shifts the weight towards the end, giving more percussive power to cuts. This allows for a greater ability to cut through light armors, and deliver more force through heavier ones.