Exactly. I have worked on highly efficient work sites where everything and everybody was working like a well oiled machine with enough brakes so everybody could

Exactly. I have worked on highly efficient work sites where everything and everybody was working like a well oiled machine with enough brakes so everybody could do their best job and short enough hours it could be done ad infinitum. And then I have seen places where unsuprising basic human necessities like "a person has to pee" or "someone is sick" endanger the whole operation. Sorry but either you want your process to be resilient and reliable OR you want a pile of burning garbage held together by duct tape that is constantly on the edge of collapse for the price of some miniscule savings that are gone when one such collapse happens.