In terms of gameplay, the Su-57 will hardly differ from something like the Su-30SM.
Seriously, the main differences are the AESA radar and a slightly different flight model. Unique missiles for it, like the R-77M, were shelved and never fully developed. Its stealth doesn’t help much against PESA/AESA radars, and the fact that it can perform a ‘Bell’ maneuver won’t save it from AIM-120s or Meteors, and so on.
In real life, this comparison would be ridiculous, but we’re dealing with a game and despite all the “realism” claims, it’s very arcadey. Because of this arcade nature, the gameplay difference between the Su-30SM and the Su-57 is minimal.
The Su-57 has much more modern weaponry, much different than what we see in game now. It also has a LDIRCM which gives it the ability to completely ignore x2 Fox-2 missiles being fired at it, it has stealth properties, maybe this blew past your head at Mach 10 idk.
It’s not like the r-77-1 is a bad missile for bvr, it’s roughly on par with aim 120a and is only worse than aim-120c5 in terms of range, while having better better time to target than either amraam model.
they can simply add su-57 with 6x external r-77-1 missiles if they don’t want to give it r-77m
su-57 looks like f-35 equivalent (although still better than it for wt, kh38s will carry it for ground and for arb the fm is much better for turning) and then su-57m will be f-22 equivalent, although f-22 will be superior in terms of number of missiles and su-57m would dominate it wvr probably. kinda hilarous how the us made the f-22 in the mid 90s