That’s not how it works. You have to consider a lot of stuff before calling something unbalanced or so. Back when they added Apex Predators f-14s had 6 radar missiles while MiG-29 had 2, would that mean that the game was unbalanced? Not really (in fact it was unbalanced towards american jets cuz that 2 missiles the 29 have are monsters).
In the case of the su-30sm although it gets a absurd amount of pretty good missiles, the platform isn’t that good (it’s a much heavier su-27 with the same engines), and that accounts a lot for the performance of the missile you’ll launch.
Unfortunately it is what it is and nothing can be done about it, it’ll only get worse in that sense (missile spam). That’s why i prefer to not go beyond 90s tech, i find early 4th gen aicraft combat more interesting.
Unfortunately it also has to do with Airframe sizes. Do understand the likes of the F-15E and Su-27 family are heavy multiroles in the sense and this ofc mean they’re also massive, and being massive means more hard points and therefore pylons