Consider that subspace missile attacks are also quite undefensible, a much much better strategy, IMHO, than "beam rape tactics", so it wasn't omnipresent in BP, for it would create a boring game, not a cool one.
I've actually FREDed this out. You can, to a certain degree, defend against a single SSM strike. That is, one or two TAG-Cs. With Balls of Steele AI, that is. The type of ship is actually quite important, as well as it's size and turret placement. Balls of Steele Naras and Karunas usually can shoot down
quite a few SSMs upon exiting subspace. Unless you're sending ten or a hundred fighters (like I did for maximum overkill) with TAG-Cs, a tight group of heavy pinpoint point-defense/Gattler-armed turrets is quite good against SSM strikes with low amounts of missiles.
..well, Maxim and TerPulses do the job better...
...all with Balls of Steele AI. Damn you Steele, for being so awesome.