Few pieces of military technology are so individually valuable to overall tactical and strategic capabilities that knowledge or possession of such technology would tip the scales one way or the other. An exception would be the nuclear bomb.
We may have embarrassingly given the Iranians a freebie, but their ability to dissect and understand it is far different from their ability to reproduce or manufacture it for any tangible military advantage.
Keep in mind, the global dominance of the U.S. Air Force isn't rooted in any one aircraft or technology, rather it comes from the massive network of supporting technologies (e.g. global radar networks, manufacturing technologies, communication and satellite tech, etc.) and personnel (e.g. intelligence agencies, engineers and scientists, pilots, etc.) that support such advanced aircraft.