I think that there is one big difference between the
NGAD program and the F-35 program. The NGAD program is not trying to make one platform be like a Swiss army knife that the F-35 was trying to do. So it's focused on being a carrier borne aircraft and like I said on the USN page as long as the USAF keeps its nose out, it should be ok. If they are prepared to undergo incremental improvements with each new tranche, and have more tranches, then they may be able get it out reasonably quickly. But the biggest risk to the program is the continual political dysfunction at Federal level in the Congress and between the Congress and the White House. Continuing Resolutions do not funding security make and many programs across the Defence landscape have been affected by this dysfunction. It creates uncertainty, extra costs, equipment and capability shortfalls etc., which snowball each year with each continuing resolution.