Is that question supposed to be for the sake of obfuscation, or are you actually attempting to raise some silly sort of point? That has nothing to do with this. It's not a dick measuring contest of who's got the most cooldowns, it's about the fact that WAR has exclusive access to a skill interaction that allows Convalescence to be part of a mitigation combo, a method of using the skill which no other class can replicate. To illustrate the point that effective HP is not always in the form of a percentage-based reduction in damage.