I just threw those together to illustrate what I was talking about better than vague descriptions. I explicitly said as much.
Which is why I edited to make it apparent that I was joking. Sorry if it wasn't clear.
Also, I actually addressed what you were asking. As I said, using decoys and two-stage swarms
can work, but ultimately you're allocating resources and magazine space to a specialized weapon which is of dubious effectiveness for one task and markedly inefficient for all others, even more so because you have no real guarantee that the enemy will target the decoys. Heck, just look at the resource costs, the difference is incredibly slim.
I went through and did some maths, and basically what it comes down to is this: If you put warheads on the size-1 decoys, if you have sufficient weight of fire to break through their AMM fire, and if their AMMs don't discriminate between decoys and ASMs, you'll get a slight increase in effective damage per volley, in exchange for spending time, RP, and lots of extra fuel to equip your ships with weapons that will be effectively useless in any other situation.
You could do it, and it would work, but it's of dubious usefulness if you already have the capacity to saturate their defences, if you have AMM ships or PD ships to soak up fire, &c. Basically, if you're willing to go to that much trouble to drain their AMMs, you might as well play the little game of dancing back and forth over the edge of their maximum range. Or you could just turn the decoys into weapons of their own with decent warheads and good speed with a sprint range and just saturate with those without bothering with anything else. :|