No one gives any credibility to the capabilities of the SU-57, lack of ability to produce them aside. Close up photos of the aircraft show that elementary features of a 5th generation aircraft are not implemented at all. It is basically a 4th gen aircraft dressed in 5th gen clothing. Its lack of stealth, for example, is well-known; it may be better than prior Soviet aircraft but orders of magnitude less stealthy than e.g. an F-35.

Someone will eventually produce an aircraft to rival the 5th gen capabilities of the US, but it hasn’t been done yet. Every competitor so far has been theater. Meanwhile, the US is actively developing and testing 6th gen combat aircraft.