I feel like the argument that "tanks heal too much" has some truth to it but gets misunderstood a lot, I believe healers would still be boring even if no tank had any healing. I'm also not a massive fan of the idea that we have to remove more from tanks to make healers feel better.

I guess I'm a bit at odds with how much Warrior heals In AOE, I think personally that should be changed to only 400 healing regardless of enemy count, Just to make it so you actually have to heal a warrior, The other thing I dislike is how Warrior is the Party healer tank...? That's something that just doesn't really fit the design I much rather Warrior be the Big Hp (passive above average tank hp would be cool), self sustaining tank that intimidates the enemy and mitigates their damage sort of support deal.

With PLD Their self healing is mostly tied to magic attacks, which I personally thing the healing on them should be removed, Instead Clemency should become a MP management healing ability that if used right will not ruin your burst, but if spammed it will ruin your burst, giving PLD the a similar trade off for clemency being a emergency button, but also giving it some general use case. (If that's too strong also healing, mp numbers can always be adjusted

GNB Self healing is really balanced, DRK barely self heals, So I don't see any issues with these two in particular.