Originally Posted by
Lyth
There's a bug where mob movement interrupts activation of abilities and even prevents their use in the first place. You can see this in particular with older (i.e. ARR and Heavensward) encounters. Later (Stormblood and on) encounters get around this by having bosses that just position themselves for the most part.
In the context of Holmgang, the original descriptions contained "binds both caster and target" (2.0) as well as "binds both caster and target and draws target in" (2.1). As an example, when you were doing Leviathan Ex in 2.2, Wavetooth Sagahin was supposed to cast an uninterruptable Dreadwash as a sort of dps check. If you used Holmgang on it and jumped away from it, the draw-in effect forced it to move towards you mid-cast, forcing the ability to be interrupted. This is also likely a bug. For whatever reason, it didn't function like a knockback ability that could be resisted. That's probably why Holmgang was specifically reworked this expansion so that it doesn't have the draw-in effect anymore.
I think that they need to fix that underlying bug to allow draw-in effects.
That aside, draw-in effects are simply a variant on mobility skills. It's like a gap closer, except that you're moving the boss to you rather than yourself to the boss. As an example, Death Knights in Warcraft used draw-in effects as a substitute for not having gap closers. Putting both on the same job is a bit like giving them a second set of gap closers. I think you either design for the relatively immobile powerhouse that pulls enemies towards them, or you go for something speedier that zooms around the battlefield. They're different aesthetics.