TLDR - they flew X-planes, not prototypes.
The TL; DR of that article is something more like this:
This tells me they are not 100% satisfied with the F-47.
Which tells me they rushed into picking it.
Which tells me they had to compromised on somethings.
Which tells me they picked a cheaper option.
Which tells me the F-47 might not have the range (small size) and the superior stealth (canards) initially envisioned for the PCA part of the NGAD.
Who knows if USAF will have the money for these "increments" with the economic storm that's approaching.
Another noteworthy point from the article is that the F-47 is expected to cost at least twice that of the F-35, i.e. 160-180 million USD per piece.
Thar's definitely NOT being cheaper than the F-22 LMFAO, especially if the F-47 is J-XDS-sized (which is indeed probable). Trump is either reading whatever the USAF or White House staff gave him, or he's just being his usual self.
As for the increments, I understand it more as the "Blocks" we've seen on the F-35s and the preceding fighter jets of the US. It's not going to be "Boeing, LockMart and NorGru competing for new F-47 contracts every 5 years".
If those aircraft being tested from 2020 and onwards were actually just demonstrators/X-planes, it means they are already BEHIND both the J-36 and the J-50 programs, both of whom look like they are at the prototype stage. I doubt they could afford either the luxury of time or money to iterate a new version of the NGAD after 100 airframes.
Yes, they are indeed behind (if not at around the similar steps as China) in this regard, even if the EMD F-47 and F/A-XX are able to take flight within this year.
This is what many Westoid/Murican military techbros/pundits are still vehemently refusing to admit, which is kinda sad when you think about it. They would rather resort to believe that the J-36 and J-XDS are mere "vapourwares of paper-tiger Chicoms" and/or "not 6th-gens at all, we get there first!" than facing reality.
Literal ostrich behavior. The US of today is not the US back during the 1st Cold War.
It depends on what they are iterating. But keeping a lot of the tech commonalities there reduces cost and time significantly. If the government went out of its way this much to ensure they own the IP/designs they're gonna make use of it as much as they can
Pretty fat chance of the F-47 being able to enter service before Trump leaves the White House on January 2029.