[contingencies]

I don't know if you have actual experience with CAD design but machine time is definitely not free there.

Heh, actually I run a robotics company. There are multiple people working for me full time doing CAD design. I would argue that delays due to tedious input in an industrial fabrication context are more expensive as you are not just using human time but also blocking on supply chain and 'machine time' scheduling, and ultimately potentially all business expenses. For this reason I do not understand your point.