Software isn't built it's designed, then prototyped, then finalized. The guy on the assembly line isn't designing an MRI machine, that's already been done, he's

Software isn't built it's designed, then prototyped, then finalized. The guy on the assembly line isn't designing an MRI machine, that's already been done, he's screwing screws into place. Building implies it's done more than once in a repetitive fashion which is definitely not the case with software, software is written to overcome that.