People over emphasize that incident, because yes it happened but it was not a product of Stealth technology failure.
It wasn't FAILURE of stealth! It was a reality of physics, what stealth aircraft produce radar return, too.
Those who do not expect to come under fire, get raded from unexpected angles, directions - much more so.
Both sides can and will play tricks.
One side is in a much better position(stealth), but under favourable environement, the other can negate it. Operating defensively under cover of AA network(mutual help), targeting supporting assets(which are just as vulnerable, and even more critical for a stealth force), avoiding open combat, abusing tactical moves and solutions stealthier side will be more reluctant to follow, and so on.
And F22 is designed to take that to the next level. Most Fifth gens can still turn and burn with the best of them.
There are things 5th gen don't do, or do worse than 4th gen, or do so only while losing their stealth edge.
F-22 onboard EW(or, honestly speaking, elint) suite is a good example. F-22 was designed to be F-15 on a new level, sure, but sone things just contradict stealth too much, and/or pursue similar aims, arguably less effectively.
Other things include variety and size of payloads(including drop tanks and sensor pods), fuel burn rates, required supporting sorties per combat sortie, turnout rate, upgradeability and so on, so on, so on.
Oops, sorry Deino. I stop here.