Paladins oath stance it is long over due.

[LalaRu]

... Paladins can use stun infinitely

This apply for every instant skill (without long recast) almost every class have (see brd). You click on the button every time it is ready.

Think about on large pulls. If you have a good threat lead and are trying to help the healers, you can currently go down the list stunning each target once for basically free mitigation (assuming WHM isn't holying.)

It works only on the paper, but have no real world application.
Each stun have to wait GCD, and you cannot ever think to rotate your stun to all mobs in your pack without lose aggro, just at 4th mob 10s have passed and the brd/blm is now tanking all other mobs.

It may work for a group of two or three mobs, but they are not a threat when you are in trash cleaning duty.

And "mount enough aggro" first, does not apply, because in real situations, you are running for aggro against all classes from the start of the pull until the end. Cannot even think you can slack on aggro a whole 10s. Unless you talking about low level duties done with your i500 tank and i-1 dps.