Not really, just look at the Flanker in stuff like SATAL before the AMRAAM update; if the bandits had 120Bs it was pretty much a fair fight, with the Flankers having the notable range and NEZ of the ER vs the Fire and Forget (but much less range/NEZ) of the 120B, which also had pretty low chaff resistance. Even with 120Cs, despite similar-ish range/NEZ considering how easy they were notch, it was still manageable. Now, the current 120B is pretty much better than the old 120C in every way except in pure Stern WEZ. Its basically impossible to notch without a super accurate RWR, and is more maneuverable than the 9M or R-73. While the SA of blue jets does help, I dont think its the main reason the Flanker isnt very competitive.
Not in any way saying the missile changes shouldnt have happened, they needed to for realism. Nor am I saying the goal for ED is to balance the Flanker artificially. Just pointing out that it was a lot more balanced before all the AMRAAM changes.