Anyway, yeah stealth is pretty useful. However it is not full proof. Just because you are harder to detect on radar doesn't mean you can still be targeted by infrared missiles.
Another problem with that newer and better radar systems are always being made. Good luck investing in research and spending money to make a new stealth fighter to replace the one that just got obsolete.
Another problem with jets like the f-35 and f-22 is that there weapon systems are built around the redesign of the hull. If one problem is encountered, it will be unfixable because you would have to entirely re-design the hull and you basically designing a new jet.
The F-35 is also a big joke. It was supposed to be a cheaper stealth plane with multi-role capability. Instead you end up with a jet slower than a f-16 with an internal weapons by. Oh and get this, they want to replace the A-10 with it by placing weapon pylons the wings which will defeat the purpose of its stealth role.
If you ask me, everyone is better off with Gen 4, 4.5 fighters, and drones. If they are going with 5th gen, they should axe the stealth thing. There hasn't been a major war in awhile, all the US and Russians do is pick on small nations that are too small or poor to defend themselves. Major wars are still possible, but they aren't as likely to happen as the small wars and counter insurgencies.