First,
Simulation and training are a very huge part of RL military aviation
Second,
Not all of that simulation and training is about a complete air campaign. Not all exercises are Red Flag. You can perfectly fly a 2v2 mission IRL, just as you would do in Lockon. You could perfectly train for a BVR shot, as you do in Lockon.
BS will bring a hitherto unseen level of faithful avionics reproduction in Lockon, with 3D-clickable cockpits. Are you going to say it is not important, since the whole thing is unrealistic because there is no Prowler around?
Please let us cut this crap and stay with what is simple and understandable. GGTharos has suggested, in this but more elaborated in other threads, a modest improvement to radar missile behaviour. I hope this little improvement will be in BS. That is all.
The concept that a simulation is somewhat more or somewhat less realistic depending on features is very valid. The concept that simulation isn't real at all because it isn't the real thing just is not an interesting claim, it means nothing. The suggestion by GG and others does. It is a meaningful contribution.