And you mean that build is better? With 25% Cool Efficiency? If someone has bought the Y-L-W but doesn't have the other variants, why must he run it with the AC20 all time? Getting closer means losing the Arm faster or even being killed. Even if you could load some extra secondary weapons in another cent doesnt mean it's better. You always have a tradeoff. In your suggestion that's Heatsinks & Ammo. Is it a good tradeoff? With hot AC2s definitely no.