Don't underestimate the effects of tradition. "We do things this way because we do things this way" is one of the strongest effects in technology. Secondly, I

Don't underestimate the effects of tradition. "We do things this way because we do things this way" is one of the strongest effects in technology. Secondly, I suspect, but do not know, that there are effects here of making big panels and then cutting smaller panels around the edge of the large one.