Just give Storm's Path to Dark Knight and Paladin
Paladin's Rage of Halone now applies 10% Damage Down debuff on top of its 10% Strength debuff
Dark Knight's Delirium now applies 10% Damage Down debuff on top of its 10% Intelligence Down debuff
Warrior's Storm's Path now applies 10% Strength Down debuff on top of its 10% Damage Down debuff
Game fixed warrior aren't mandatory anymore and we have two choices for strength down, two choices for intelligence down, and all three tanks gain access to the best debuff in the game. Note I still personally think Warrior would still be the best tank class after this, but this would at least make PLD/DRK a viable comp.
and real talk it's kind of dumb the 'defensive tank' doesn't get the best defensive debuff