https://www.19fortyfive.com/2022/03/why-the-f-22-raptor-stealth-fighter-only-serves-in-the-us-air-force/
On the other hand...
China's New Stealth Fighter: Built From Stolen F-22 And F-35 Technology?
https://www.19fortyfive.com/2021/09/chinas-new-stealth-fighter-built-from-stolen-f-22-and-f-35-technology/
I'm sure there's still a lot of proprietary equipment on there, but now that China apparently stole a lot of the F-22 tech, the need to keep the aircraft as US-only is reduced
And of course Quora weighs in on whether this actually matters
https://www.quora.com/Were-the-Chinese-able-to-steal-meaningful-F-35-and-F-22-fighter-jet-data
The Pentagon Is Slashing Its Annual F-35 Order by a Whopping 35 Percent
https://www.popularmechanics.com/military/aviation/a39465052/f-35-orders-cut-by-35-percent/