The F-35 requirements have been rewritten many, many time prior to this. Range, weight, performance, price, schedule, electronics, STOVL capability, carrier adaptability, helmets, on and on.
The only target that does not change is it's ability to enrich LockMart and deplete the Treasury with unerring, unmatched, accuracy.
LockMart's New F-35 (Now with more electrolytes!)
The RAH-66 Comanche was an example of what happens when there is this so-called requirements creep. We worked on stuff for it at the company I retired from and all of a sudden, one day it was cancelled. 22 years later and who knows how many billions.
We were also doing work on F-22 parts - lost that - and the Boeing offering for the new stealth fighter, which lost to competitor Lockheed. It was a butt-ugly plane, I don’t know that it would have turned out any better.