probably motors and power electronics, requisite precision as well as durability requiring more materials, or perhaps due to lack of cost saving pressure - the

probably motors and power electronics, requisite precision as well as durability requiring more materials, or perhaps due to lack of cost saving pressure - the (whichever)government will pay, will appreciate extra reliability, and extraneous cost is just extra cash flow for the company and genuinely positive for economy too; there's no need or even tangible benefit to meeting goals at slightly south of theoretical minimum cost in the way it has to happen at microscopic scale(at home)