Since on paper government cares about cost efficiency and you have to consider that in your lobbying materials.

Also it enables getting cheaper programmers who where possible might be isolated from the actual TS materiel to develop on the cheap so that the profit margin is bigger.

It gets worse outside of the flight side JSF software - or so it looks like from GAO reports. You don't turn around a culture of shittiness that fast, and I've seen earlier code in the same area (but not for JSF) by L-M... and well, it was among the worst code I've seen. Including failing even basic requirement of running on a specific version of a browser at minimum.