It...often doesn't matter? IMHO, you're paying too much attention to this "generation" thing.By virtue of its scale and capabilities.
I'm not claiming that on a single airframe level the aircraft is individually that capable. But when looking at the number of F-35s that are in service today as well as the number of F-35s that will enter service in coming years (versus how many opfor 5th gens will enter service), I think it is quite a reasonable thing to say.
It doesn't really matter if a J-20 or Su-57 are marginally more maneuverable or kinematically superior to F-35, if there are tens more multiples (or in the case of Su-57, hundreds more multiples) of F-35s in service each of which have equal or perhaps superior VLO, sensors, weapons, and networking.
In the case of the PLA, the relative threat and overall capability of the F-35 will depend on how quickly they can induct their own 5th gens as well as their multidomain offensive counter air/strike capabilities.
I mean seriously, F-35 can count as the best tactical aircraft available - at least, for now. But tactical aircraft is a very generic term, and as all generic terms - it won't help you best in a particular situation. What matters is what you are doing in this particular engagement and in this particular conflict.
For example, with all your VLO, sensors, and networking, in air defense mission you either intercept archer or, at worst, - arrows.
VLO doesn't matter when you need to reach, say, Blackjack in time, before it'll release its salvo of cruise missiles - and will just afterburn back into Arctic or Pacific airspace. Because good luck catching all 12 of VLO LACMs sneaking in different directions afterward. So, basically, you won't be doing any better than an ANG F-16v*, for way more money over your service life.
*arguably worse, because SABRE is built specifically for this sort of work.
Sensors and networking won't really help you to intercept WZ-8 drone gaining final targeting data on your carrier strike group. They won't place you into position to intercept a salvo of YJ-12s going at your carrier, unless you're already lucky enough to be precisely there. Lucky - because by the time of their launch, it'll already be essentially determined, do you have a shot at them or no - and it's up to the attacker to choose attack vectors and patterns, not up to defender.
Again - no advantage over SHornet Blk. III.
Sensors and networking won't stop, say, a Foxhound dashing at 80'000 ft against your force multiplier.
Here it's even worse, because all other 5th and many 4th gen fighters will actually solve this problem much better.
What's common in all 3 scenarios is that I haven't even put F-35 itself under attack, as @MarKoz81 did. I only added something to protect - and F-35 starts to show its shortcomings. F-15EX - is fine, Typhoon - is fine, Su-35 - is fine. But for F-35 this is just not something it's good at.
I can go on with other DCAs, or specific types of OCA missions, or strike ones - but this is largely redundant, as, again, MarKoz did it already.
F-35 is a strike fighter. Advanced, capable, but strike fighter. In "American century" this would've been enough - the only serious opponent then was Russia, and it doesn't count as anything close to an equal opponent to the West on its own. But F-35 essentially missed this American century.
China breaks this equation. Not only on the primary axis of competition(i.e. on its own), but on secondary theaters, too - because the US at this point starts feeling the need to measure applied forces and actions, just in case.
And here your single, single-engined, heavy fighter-bomber bites you back. And, apparently, fails to replace even F-16, which has no advantages except for the price.
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