I think the right question is why are roofs not already made out of high-impact glass? Did nobody ever think about this before Elon? Maybe. More likely a gla

I think the right question is why are roofs not already made out of high-impact glass? Did nobody ever think about this before Elon? Maybe. More likely a glass roof is a net negative that has to be offset by the solar cells, making them less cost effective than otherwise.