Seduce is extremely unreliable. If it's resisted, the succubus is dead, the mob will be on her like white on rice.

It doesn't hold for very long. It seems like as far as crowd control goes, it's a short duration, it almost never holds as long as it should, so there must be more chance to break it.

Soon as it breaks, your succubus is dead. So that seduce is not coming back.

I've managed to re-seduce quite a few times at lower levels when the succ isn't 2 shotted by mobs, but at the higher levels, I have never been asked to break out the succ for CC.

Warlock CC is limited to banish/enslave for the most part, pet off tank in a pinch and in a really tight situation, you can use the succ.

That has been my experience with locks both before I played one and after I have a raiding 70. Name is Vetis, currently on Eitrigg.