I was friends with a lady who worked at a dress shirt factory. She ran the bolt back and forth on a carriage over a long table and the stack was cut by another guy with that knife I showed earlier. I imagine it all depends what you're making and what you're making it out of whether you die cut or not. Fast fashion (which Levi's aren't) would not be die cut.

I make boat canvas and layout and cut by hot knife. The only efficiency I get is if something is symmetrical I cut both side at the same time.