The F-35 it's multirole. single-engine, all-weather, stealth multirole combat aircraft, designed for ground-attack and air-superiority missions. So it has to deal with all kinds of dangers. It's I-want-to-do-it-all aircraft that will not outperform anyone who specializes, unless the technical advantadge is on, ie. killing by range without being seen. But F-35 could kill lesser aircrafts, maybe 3 or early 4th generations but cannot outmatch other fighters with same technology. F-22 is way better for that.
3rd gens? Really? Don't you think it's a bit unbecoming to exaggerate so much considering it has achieved 15:1 kill ratios? It's IRST capability even actually gives it the capability to spot F-22's first. Furthermore, the F-16 was do-it-all aircraft. And it did it damn well. The F-35 is even better.
New generations fighters have the same range detection. And "stealth technology" is still on claim, in fact russian radars detected many planes with ease. An F-117 was shot down too. I will not rely on that, since all the 4th gen airplanes and 5th have same capabilities.
RCS reduction specifically targets X and S band radars because those are the ones which are precise enough used for firing solutions. You need those bands in order to either direct a missile onto a target or have a active seeking missile find it's target. What you're talking about is L band radar, which has existed since the 40's. But it's use is as a early warning system. The problem is that the resolution of it is orders of magnitude worse. For it to be actually useful today you need to build a massive radar which is very power hungry. That's a perfect target for a first hour cruise missile strike.
And that's not even getting to the part that the only reason why L band can even detect F35's and F22's is because that they have features like vertical stabilizers which are too small relative to the wavelength. B2's and B21's do not have this issue.
Finally the idea that one F-117 shot down somehow invalidates that fact that the F-117's stealthiness provided it protection with 99% effectiveness is absurd. The reason why it was shot down was because of USAF's arrogance in flying identical flight paths day on day and a SAM operator realizing this and succeeding in targeting it the moment it opened it's bomb bays, when it's stealth was degraded.
