Mass manufacturing of solar panels is a lot more complex than stamping steel parts. For example, one of the big wins was diamond (I think?) cutters for crystal

Mass manufacturing of solar panels is a lot more complex than stamping steel parts. For example, one of the big wins was diamond (I think?) cutters for crystalline silicon, which allowed panels to be made rig far less inputs. A big competitor before that was thin film, and maybe you have heard of Solyndra, who had a heat tech that was made obsolete because this advancement in cutting silicon. Any improvement along the chain of silicon production to siping to assembly has a chance to reduce costs, and it's usually small incremental bits of 1% here or 2% there.