THe bolded isnt correct
The SU-57 is not a copy of the F22 by any means. It ha very different design objectives than the F-22.
The F-22 was designed to be an air superiority fighter with major emphasis on being stealthy at all cost. Thus why it' so expensive that even the U.S. AirForce couldnt afford to order more after barely buying 1/5th of what they had planned.
The Russian saw this and found a way to make a SOMEWHAT stealthy fighter with emphasis on super-maneuverability. Most experts will tell you that the SU-57 is not stealthy at all due to it's cross-section near the fuselage or at least nowhere near as stealthy as the J-20 or F-22 however it will outmaneuver all of them. See pic below how the intakes are positioned in a way radar beams can reflect on them. Compare that to the bottom of the J20, F22 or F35 and you'll see the difference
SU-57 Fuselage
Russia is essentialy betting that newer radar technology will eventually catch up to the stealth technology that was used for the Chinese J-20, American F-22 and F-35. And truth is... they are probably right. IRST technology is what the US and all other countries are using to fight against stealth aircrafts and the technology is getting better every day. Chinese and American scientists have also been claiming to have found new ways to detect stealth aircrafts. This may render the the F-35 almost useless because if you recall even the Pentagon says "the F-35 cannot fight by itself".
The SU-57 focuses on IRST and combat technique called beaming to confuse the radar rather than evade it completely.
SU-57 IRST pods for beaming
Besides, all that stealth of the J-20, F-117, F-22 and F-35 only works when they are coming towards the signal source head-on. Various combat techniques can be used to counter that. THus why the U.S. came up with the Growler program using old F-18s and newer F-18s to seek and destroy these radar configuration techniques to allow their stealth fighters to exploit the vulnerable targets' radar 1-on-1 which is what it's build to exploit.
But in the end American avionics has always been superior to Russian avionics while Russians have always made the more maneuverable fighters. And in this age of technology you need your tech to be on point. The F-35 has the best avionics out there right now even tho it's a sitting duck in an air-to-air fight. The F-22 is the best fighter (in service) but it's avionics dates back to the late 90s and need to be brought up to date to that of the F-35 and SU-57. The Pentagon has been struggling with money because the United States are over extending themselves + the expensive mess that is the F-35 program is gobbling up all the money.
Good luck with all that
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