Because the extra HP is already made up by 20% Damage Reduction on Shield Oath. And for a Warrior with the same gears as a Paladin to "always" have 3k+ more HP, the Paladin needs 12k+ HP so your math is fail. Thrill of Battle only lasts 20 seconds and is one of the defensive Cooldowns so it doesn't count. Shield Oath doesn't last a few seconds, just like Defiance and it's better. You are trying to make PLD looks underpowered compared to WAR when it's not.
