Maybe its not designed to fight low tech wars ? Of the three conflicts mentioned, only Iraq even had aircraft that might challenge ours and they were destroyed right after the F-22 first became operational. The Iraqi aircraft were way outclassed by most of what we had and by our pilots so why risk the early iteration of the top high tech fighter versus these guys ? Big risk for little gain. So its capabilities could be exposed to Russia or China ?
@kellyjo5150 Russia has no interest whatsoever in becoming involved in another conflict with the US. Meanwhile, China proves quite adequetly that you don't need a war to take over the world. You can simply buy it using cheap labor. Furthermore, if ever there was a conflict between them, the US economy would collapse overnight before the first shots were fired between them.
The US would be seen to be the protagonist in any future war between Russia and China, and could therefore expect no help from the EU or AsiaPac (not many countries really want to get into bed with the US after the GW Bush fiasco anyway).