How do you define failed exactly? Because there are multiple vehicles that failed for multiple different reasons. Such as
R2Ys: the actual R2Y would have been a prop plane, the jet powered abominations we have in game are less real than the YaK-141 is.
F-20: Failed heavily as an export vehicle to the F-16
Mirage 4000: Also a failed export vehicle
F-16AJ: was only a proposal that never went anywhere else. Its not even correctly implemented in game afaik.
T29,T30,T34,T92, MBT/KPZ-70, XM803, XM800T, 120S, Ru251,TURMIII,HSTVL, all of these “failed” because they didnt meet the proper requirements, went overbudget, a war ended, or some other reason. (I could list several more none russian things but this post is getting long enough as is)
Dont be disingenuous and misleading last i checked both Germany and Sweden are sitting comfortably at 60-70% wr or higher at top tier ground if not higher.
That is straight up false, you dont just “do a software update” youd need a whole new radar, wiring and even pylons depending on the plane.
According to your hair brained logic if all we need to do is “software updates”, every single vehicle capable of using AIM-7s should get AIM-120.
Are you fine with the F-3 Demon getting AIM-120? I mean clearly it should since all it needs is a simple “software update”
I could keep going on with this but its pretty clear that for somebody that “knows what they are talking about” you are really good at spewing a bunch of nonsensical BS so its best i dont bother.