These sort of war machines aren't designed for economic parsimony. Their sole purpose is to dump tons of money into the MIC. Partly to line the pockets of the higher ups and partly to maintain the massive jobs program it has become. Defense superiority is really secondary or tertiary. The gold plated requirements list forces the sort of complexity that keeps the contract gravy train running. The real trick of managing a defense program like this is finding how much you can go over budget without getting cancelled.