Because all your viewpoints are based on speculation.
No, some of you is just trolling around.
Everyone here knows basic history of USAF AC development and how it works.
There is YF- prototype/tech demonstrator and F- production variant.
YF-22 started flying in 1990. F-22 took its first flight in 1997.
X-35 tech demonstrator flew in 2000. While F-35 first prototype flew in 2006.
NGAD prototype flew in 2020. And production representative F-47 will fly 2028. Nothing radical here.




