Earlier quoted context omitted.
The F-35 failed because fighter jet airframes aren’t particularly relevant anymore. You can stick the same sensor systems and missiles on just about anything. Improved stealth etc is useful, but F-35’s are only slightly better than 40+ year old jets. Thus hardly worth the price vs cheaply manufacturing a minor update of an older design. Or as the saying goes “quantity has a quality all it’s own.”
Curious what your background is to make those statements. My experience from Red Flag and other exercises is that the 5th gens (22 & 35) have a much better K/D and survivability. When you expend all of your stand off weapons or need to get a B-2 deep into a contested airspace, including against SAMs, you need a 35 going in to do sanitization. No F-16 is fighting off both SAMs and a huge ass wave of J-10s or any J-20s…
My impression of the present/near future of air combat is a stealthy fighter with AMRAAMs in front, radar off, and a quarterback aircraft in back out of missile range, with the radar on. The front fighter fires and turns around, and the missile gets mid-course updates from the quarterback aircraft. When the AMRAAMs are depleted, you leave. It seems like if you get into Sidewinder range and you're outnumbered, you're going to have a torrent of medium range missiles coming at you from all sides.
It's not clear to me how well newer radars can track the B-2, but it's hard for me to see how fighters could really protect it. I'd expect that in a conflict with China, if they can track the B-2, that the B-2 would be withheld until the fighter threat was neutralized.