I mean, it's one of the most staple versions of the famous Sukhoi Flanker family,so why hasn't it got featured in any game?
Sukhoi is a prominent manufacturer seen in AC. It's up to PA whether they want the Su-30 in the series' roster or not.
My guess (just a guess) is that Namco Bandai/Project Aces doesn't want to add yet another Su-27 variant to the game, as this would probably take significant time and resources. The fact that the Su-30 hasn't appeared in past games doesn't help.
Su-30M will be in Ace Combat 7: Skies Unknown.
What do you think?