They fail in the gaps. A contractor waits on a drawing nobody chased. A permit expires two days before the crane arrives. Two disciplines each assume the other ordered the material. By the time it surfaces in a monthly report, the window has already moved.
Following up a project properly is a full-time job, and on most industrial sites it is handed to someone who already has one. We take it on as the job it is: one accountable contact, tracking the work against the plan, raising problems while they are still cheap.