There is an ability to debrief after a competitive process typically, but whether that's placating or whether that's providing actual information is something to be decided on a case-by-case basis. Certainly if you're looking at value, absolutely. A competitive process is going to provide typically a better value to the government, to the taxpayers. At the same time there are legitimate national security interests that might come into play.
Just stepping back from this a little bit, if you're saying that a supercomputer for weather forecasting and other uses invokes national security interests, I can see how that might be. If you're talking about office paper and paper clips, I struggle to see that. Perhaps there's a reason but I would suggest there likely isn't.