OP must be trolling or something.

Tank stance never gave damage, it even used to be -20% damage for Paladin for the longest time and the job became undesirable at the end of HW for a variety of reasons that are beyond tank stances.

Warrior had Unchained to use with Defiance which made it the optimal tank to always pull raid bosses because they got full aggro along with no damage decrease. You were actually losing damage pulling raids with a Paladin or to a lesser extent, Dark Knight.

All the good raids were also bringing Ninjas for aggro control so they didn't have to use tank stance at all, because the best mitigation in this game is more damage. It added division in the community between casual players who would always leave tank stance on and have lower damage versus good players who knew when to turn it off for most damage. Another thing no one misses Stormblood, DPS having to actively control aggro with a debuff.

Yeah, let's not look back.