Exactly. T10-T12 are essentially Dummy Fights. Melee's rarely do anything, but just DPS a single target. There's very little movement in any of those fights, excluding T12 P4. Even then, you can adjust your raid positioning to make it VERY melee friendly.

Either the strategy handling mechanics is bad, or the Dragoon isn't playing to the best of his ability.

Also, TA is around 2% overall raid DPS. It's a very over-hyped ability.