I’d say they failed to make it cheap enough, although maybe that goes with “simple.” I needed a roof replacement around the time when this looked like a viable option, but there’s no way I was going to pay a substantial multiple over the price of a normal roof plus solar panels for their snazzy integrated roof.

Invisible solar is a genuine use case in areas with shitty power tripping HOAs, but even regular solar takes a decade to break even, so if you sell something like that at inflated Tesla level prices then they simply never will and there is no reason to buy them in the first place.

It think they under estimate the 'Green bling' factor. For many people if they are going to get solar, they want the neighbours to know. Got to get that virtue signalling in.

Not saying it is a huge factor but it is there.