The F117 isn’t active anymore is it? IMO its a combination of things but the F35 tries to be all things to all people, a sure recipe for failure.
i found this article...http://intercepts.defensenews.com/2014/11/we-now-know-why-the-f-117-is-still-flying/
Kinda like moth balled - but maintained...that was a expensive piece of UFO history and op to be placed on the side burner...but then again....they would not have launched the F-22 or F-35 into operation...