Alright, but they probably still had some S-5s in reserve. It's not like I'm asking for Vikhr or aim120 or something. Just something that *could have reasonably been used* and also provides variety and a better product. It won't break the game, (because we are, in fact, playing a videogame). I think there are way larger issues with suspension of disbelief than having rockets that are still in stock be mounted on an aircraft they could totally be mounted on and probably would have if it came to conflict.
As far as I can read, S-13s would fit and be usable without any modification. Same argument as above, I suppose.
Anyway, I understand realism is an important issue, but in my opinion a *possible* 0.0000001% realism loss that 99.999% of people don't even know about, is worth sacrificing to get a better product.