I don't care about it itself being able to be interrupted, I never use in a scenario where that can happen anyway. And even if it does, it doesn't really matter, just do it again, I just need the shield to be up when I tag in beidou.
And what do you mean with long? the animation? It's like a second for the hits. If you mean the cooldown, it's pretty much a non issue since I'm rotating to other characters anyway and she has the sacrificial greatsword, which resets the cooldown more often than not.