The problem is that the X isn't a particularly large SUV. The X is slightly wider and about 1ft longer. And in many ways it's inferior to the Y. Tesla's mega

The problem is that the X isn't a particularly large SUV. The X is slightly wider and about 1ft longer. And in many ways it's inferior to the Y. Tesla's mega casting and structural pack gives the Y excellent range and a lower weight for a cheaper battery. I think the reason Tesla hasn't done mega casting and structural packs for the other lineups (besides the equipment costs) is because it'd make them eat into the revenue of the top tier models. A model 3 cutting down several hundred pounds would be range competitive with the model S. The shorter range LFP batteries could still land you in previously long range land.