We're not talking about flashing "moves", but more complex mechanics. As a PLD, you don't have to manage a lot of things. Up to 50, enmity was never an issue, since you did only your enmity combo. Now, it's rarely an issue on single target, since even your more powerful combo has some kind of enmity bonus.
The two timed effect fits nicely for a GB-RoH-RA combo with a little skill speed, and your MP are almost useless.
Changing stance is higly impractical to discourage stance dancing too much, and both Oath only have passive effects, so you don't really care which one your on as long as you keep aggro and survive.