Tank Swapping Stance

[SarcasmMisser]

For the PLD:

Tank stance = enmity bonus, accuracy bonus, effective health bonus via reducing all incoming damage.
DPS stance = extra damage on auto-attacks. That's all.

Going into either stance incurs the GCD. That's why PLDs don't really do stance dance (they do switch stances when there's no incoming damage, but nothing close to the stance dance healers do)

You forgot the massive DPS penalty in shield that doesn't exist for sword. Good PLD do stance dance, the GCD penalty is a trade off and they have to consider it when deciding if a switch will be a gain. This is why people are so confused when they see PLD do as much damage as an average bard when in a MT role because they are surrounded by tanks who dismiss their DPS potential and spread nonsense, it's actually very easy if you actually take your DPS seriously.