The rockets NASA uses are built by other companies, and the companies that get the contracts to build them are usually awarded by congress.
In this case, the "mainline" rockets are partially built by ULA which is a partnership between Boeing and Lockheed Martin.
In conclusion: NASA is rudderless because a bunch of congressional stooges have pushed incompetent companies to build its hardware.
BLAME THEM, NOT NASA.
Thank you and have a wonderful day.