If building materials and factory production lines was basically free and instant you'd see a ton of strange and complex creations be done by mechanical enginee

If building materials and factory production lines was basically free and instant you'd see a ton of strange and complex creations be done by mechanical engineers or other people working in physical space. Instead of the current sleek cars you'd get abominations with things sticking out everywhere to save engineering hours etc, and nobody would know how they really work.