As if threat is even an issue since 2.1. Unless ur spamming your cure, a crit means less mp your spending to get the tank back to full health. And tell me crits are useless after your tank eats a death sentence or wicked wheel.
ofcourse it benefits whm. . If healer share the allagan 2gear they will need to make at least 50/50. Wouldnt be fair for either if its benefit one class more.