F-35 has exactly the level of stealth that the US is comfortable exporting (the RCS of a plane is something baked deeply into the design of the airframe it can'

F-35 has exactly the level of stealth that the US is comfortable exporting (the RCS of a plane is something baked deeply into the design of the airframe it can't be really changed for an export variant). F-22 is the "I win" button that the USAF has in its back pocket if it ever starts to get truly pressured in a conflict.