Again this whole premise is based on premise that current radar tech stays at level they are at now which is a very generous assumption. Or that the F-22/35 radars has the exact kind of scanning power as you put forth. And they are ceding every tactical advantage to the Su-57 to begin with (no jamming of their own+ AWACs support).
Correct, but RAM can also be upgraded. GaN is probably going to result in an effective doubling of radar ranges against stealth aircraft without jamming interference. The point, though, isn't that the Su-57 can see the F-35s / F-22 before the latter see them, but by the time the F-35s / F-22 see the Su-57, they're both within visual / IRST range.
And that is money that Russia is never going to see in their coffers. If China was to apply metamaterials to the SU-57 it did have to be doing it at the production line itself already, which will mean that the whole production would have to take place in China as no way on earth is China going to be loose regarding its stealth tech. And the main claim for this contention is the extremely sketchy claim that a Su-57 without RAM is going to cose a mere 37 USD. I mean come on we are already seeing the Su-35S costing more than that (85 mil) and that is a fighter not build to stealth tech tolerance, no AESA radar and No RAM. Russia can make as many bombastic claims as they want but they cannot just simply wave a magic wand and hope the cost just vanish into thin air. In fact the very notion of it is borderline laughable.
The Su-35S exports to China include support packages. Likewise, the Chinese have been shown applying metamaterials in experiments to their existing stealth aircraft, i.e, the metamaterials can be applied after delivery.
This premise has been talked about before , the heavyweight fighter vs medium weight fighter ala which is the better dogfighter. And we have seen that application in real life before, the P-47 vs the Fw-190 and the BF-109. In the end the P-47 was able to utilize it's heavier weight and inertia to effectively energy fight the lighter fighters, the same principle can be applied to the J-20 as well. In fact with the prevalence of high off bore missiles, we are likely to see a completely different kind of dogfight in the modern skies. Nor is the J-20 that hideously expensive when compared to the F-35, with just only 20 or so copies in service, a 110 million price tag is to be expected compared to the F-35 that has more than four hundred copies in existence.
And again, to say that the Su-57 can exceed in this role as a so called "low cost fighter" really does applies if the Su-57 can achieve that kind of price tag and still remain an effective fighter: That, when we have every single evidence to the contrary .
The problem isn't as to whether the heavyweight or medium weight aircraft is the better dogfighter, the problem is which one is better for cost. Heavyweights typically cost more than mediumweights for the same technology level, i.e, the mass actually costs money.
This whole discussion has devolved into the notion that China has a reason to buy the Su-57 in bulk, when that reason is propped up by very unsubstantiated claims. While the Su-57 is a competent fighter design with a lot of potential. There are still things that it cannot do, which is to bend the law of physics and economy.
As I've said before, if the Russians can get the Su-57 at a cost befitting a "Silent Flanker", the Su-57's stealth being somewhere between LO and VLO doesn't matter. It's cheap. It can be produced like sardines and thrown at the opponent, with the J-20 functioning as the high.
Beyond that, as I've mentioned before, the Ruble has crashed and the RMB is likely to appreciate in the years to come (GDP deflator / PPP conversion is very high). The J-20 could eventually cost 220mn a pop if the RMB reached 1x PPP to the USD. When compared to cheap-ass Su-57s and a crashed Russian economy, the Su-57s are a good deal.
I'm curious, where exactly are you from? Are you Russian? You seem to mention Russian views on dogfighting / WVR uber alles a lot, but the attitude (J-20 is the be-all end-all of fighters) is more Chinese or Pakistani.