The difference between Silence/Stun and Pacification is that other classes can Stun and Silence. Until there's more classes have access to pacification I don't really see it being a thing on hard content. I don't mean to sound like I'm moving the goalposts, but there's nothing harder than Ifrit (Hard) that can be pacified right now (I guess you could say Bone Dragon is harder, kind of maybe). If, say, Twintania could be pacified and prevent Death Sentence and plummet it'd be great for Shield Swipe, but it'd also mean that you're basically required to bring a paladin.

They could take the blocking requirement off of Shield Swipe and add pacification to another class (Rain of Death and One Ilm Punch are kind of crappy) and make more content that's pacify-enabled - that'd be fine too, but it requires changes for other classes and I'm just spitballing for paladin. Paladin has a lot of stuff that's of questionable usefulness in harder content, so I'd like to have one of our things with a fun mechanic like block reaction be a bit more useful.