Yup. But NASA is notorious for change orders and the contractors rape us taxpayers on them.
That’s the other half of the equation.
NO CHANGE ORDERS> PERIOD. It should bed written into law for all government contracts- NO change orders, no delays, to exactly balance the absolutly enforced obligation of any and all contractors to deliver.
Some things should be absolute and unchanging; any contract for design, building or implementation should be so on both sides.