They're mechanisms for transferring tax money to gigantic employers that employ people across zillions of different congressional districts. It's a doublespeak to avoid having millions of people on a program that would otherwise be termed "socialism" or "welfare".
SpaceX/Starlink, on the other hand, are more interested in shipping and servicing customers and getting revenue thereby than being approved by a constituency and/or the existing military-industrial complex.
The DoD and SpaceX were built for drastically different purposes, and it's no surprise that they have drastically different change control procedures.