How would you fix Warrior?

[Gamemako]

This would be super nice in terms of balance, but it might go against their design goals (maybe they like WAR dipping dangerously low every time they take a big hit?) I'm not sure.

I would have to agree. A PLD acts before damage is delivered; a WAR acts after damage is delivered. A shield would make WAR proactive.

[Hachiko]

I would have to agree. A PLD acts before damage is delivered; a WAR acts after damage is delivered. A shield would make WAR proactive.

Well the idea that WAR is all reactive is kind of not accurate in the first place. Our only really "reactive" mitigation is Inner Beast

Featherfoot = Proactive
Foresight = Proactive
Convalescence = Proactive
Thrill of Battle = Proactive (but can be used as reactive)

[Gamemako]

Featherfoot = Proactive
Foresight = Proactive
Convalescence = Proactive
Thrill of Battle = Proactive (but can be used as reactive)

I highly disagree. Only Foresight is innate and proactive. Featherfoot is cross-class and proactive. Thrill of Battle is either, because it always recovers 20% of your HP. Convalesce is reactive; the ability won't do you any good until you've already been hit. It is also cross-class. IB is reactive, Bloodbath is reactive, Wrath's healing bonus is reactive, Storm's Path is reactive (and sucks), and cross-class Mantra and Second Wind are reactive. So what you really have are:

1-2 innate proactive (Foresight, Thrill of Battle)
2 cross-class proactive (Awareness, Featherfoot)
5-6 innate reactive (Defiance, Inner Beast, Bloodbath, Mercy Stroke, Storm's Path, maybe Thrill of Battle), plus 3 more which enhance reactive (Berserk, Maim, Storm's Eye)
3 cross-class reactive (Second Wind, Convalesce, Mantra)

Innately, reactive outnumbers proactive 5-1 if you exclude ToB or 6-2 if you include it in both. In total, you have at 3-4 proactive and 8-9 reactive, plus 3 more which support reactive. This is clearly intended to be a reactive tank, not a proactive one. Compare to PLD:

6 innate proactive (Rampart, Sentinel, Bulwark, Shield Oath, Hallowed Ground, Awareness)
1-2 cross-class proactive (Foresight, Stoneskin if you're really smoking something)
1 innate reactive (Convalesce)
2-3 cross-class reactive (Mercy Stroke, Bloodbath, Stoneskin if someone hit you on the head really hard), plus 1 which can play a minor support to reactive (Fight or Flight)

It's clear enough that innate PLD is almost exclusively proactive while innate WAR is almost exclusively reactive. PLD's proactive abilities are also simply more potent than WAR's, and the opposite is true of reactive abilities for PLD. WAR gets more abilities which enhance the power of those reactive abilities, while PLD doesn't because PLD doesn't need them -- PLD is a proactive tank.