AI fired missiles will be an area of ongoing work that will have pretty sweeping effects on most parts of the game. As such, this is only the first part of a much larger revision to air combat, which will eventually include radar guided missiles and new tactics by the AI.
For the time being, the AI is restricted only to firing IR guided missiles. Until chaff is functional (which will come with radar guided SAMs) I wasn't comfortable with allowing the AI to fire radar guided missiles since there'd wouldn't be much in the way of counterplay yet.