This is what I have been saying, F-15C in FC3 is from 1996 whit AIM-120C. While Su-27 is based on 1986, 10 years difference, still some want to push even more. No wonder people are screaming for something modern on Russian side or keep it to same timeframe.
There was many squads that had their stock Su-27/33S upgraded to test today's Su-27SM/SM3/Su-37/Su-35. But that was only testing because no funds was there to buy them.