I get that DPS builds don't incorporate mass tactics feats, but iSunder is one feat. One feat which increases the party damage to bosses by quite a bit.
Someone mentioned that forum builds have tactics. That's fine, I can tell you for a certainty that I have seen nothing used against bosses for months now. I have a pretty good view of it so I would know if Sunder or anything was used.
DC bonuses. Really? You pick up any item in the game and it has a +10 to something. I don't mean weapons either. You have rings, belts, all sorts of options. Oh, and EDs. You're in LD? +1928 to DCs.
My question could be asked another way, why are raiders so single minded in looking for +1 more damage that they ignore feats which could add, potentially, 10% more damage to ~8 people? Assuming everyone does roughly your damage, that's +80% damage vs a few points.