A lot would have to do with the volume of work that has to be done. There's a long history of how, when something happens, new rules are brought in, and more and more new rules keep being added and they are very rarely taken away. It's a big conversation, but procurement carries probably a dozen different policy objectives, from small business to regional...to supporting diversity, to value for money, and some of it is in very protected sectors.
You're looking at shipbuilding. You can buy from only three suppliers. That limits competition and has its issues. It's a very big topic.
I guess the only thing I would say is that from observation I don't know of another country or jurisdiction that thinks they got it right and that we could just copy. It's a very tough thing to balance industrial policy, value for money and the things that the armed forces and the Coast Guard are looking for.