Board Thread:General Discussion/@comment-179.179.120.33-20150204164152/@comment-25370154-20150205220055

Making the SMBS built-in would force BN to seriously nerf the XFA-27, like giving it a F+ as initial damage against both air and ground targets, since you would be able to fire 4 missiles at once instead of the conventional two.

I personally see the SMBS as the very first Special Weapon, not in the common sense of something you fire against an enemy, but as a system which grants you more firepower than any other aircraft. And here the balance issue I mentioned above arises: I don't think BN wants to release a Multirole which can outclass every other one...