Correction : there is no reason for the current iteration of Seduction to even exist. If anything, Seduction is long overdue for a modern update.
If you think the current version of Seduction is bad, allow me to tell you a horror story. There was a time (to be precise, it was Battle for Azeroth expansion launch PTR. Despite being tested/called out and notified by the developers, yet still hit live servers), the Grimoire of Sacrifice’s ability that you gain from sacrificing the succubus, is Seduction.
So we literally had a Command Demon button that, if not interrupted, puts us in a pro-longed channeling a CC, unable to do absolutely anything unless we hit escape button, break the channeling on Seduction, ending the CC - which defeats the whole purpose of using the CC the first place.
Here’s the funny/irony part of the story - the developers admit that putting us on a CC that requires channeling, thus unable to do anything for the entire time, is ‘terrible gameplay’. If that’s the case, shouldn’t the same logic also applies to our pet? Why design an ability/utility that forces our pet to be doing absolutely nothing for an extended period, when it is clear that pets are an important part of our dps?
The worst part is the similar i’m-busy-channeling-cc-so-no-dps ‘mechanic’ is also somehow shoved to Doomguard’s version of slow cc. So here we relives the sarcasm/irony: we took a capstone/ultimate talent to control a Greater Demon to do more damage, just to have their CC/ability to stop them from doing the exact purpose why we take the talent for.