Quite frankly, all of the tanks should have one of the melee debuffs instead of debuffing main stats.

WAR already does slashing, allowing PLD to bring blunt with some sort of shield-esque animation ability, while letting DRK bring piercing by poking it to death (Or vice versa).

This not only increases overall raid DPS instead of using stat debuffs; but it keeps WAR in it's own little niche (since they basically buff themselves) while allowing players to pick and choose what tank they want to bring based on the overall raid comp.