The F 22 is waiting in the wings and ready to go, cheaper and just as efficient.
One of the services, I think the Marines, wanted a vertical takeoff/landing fighter. One F-35 variant was thus designed to do that. Probably this ability to be a swiss army knife fighter is what made it so expensive. BUT it also means the F-22 can't do everything the F-35 is designed to do. Maybe the F-35 can't either, I don't know. But the F-22 certainly cannot.