User blog comment:Xilinoc/Ch. 684 - The Blade/@comment-24769684-20160728121813/@comment-24769684-20160728142125

But, as I've said before, why does hypnosis work? There's nothing to explain why it can affect Yhwach's vision of every single future instead of just the one in front of him. We're just told "it works cuz it's hypnosis hur dur dur" without any exploration into how it can go as far as the Almighty. And it's awful, so awful, to have an enemy defeated completely by their own hubris instead of anything the protagonist does

And I can kind of see why Ichigo's sword reverted back to its old form, but that still sucks hard. It erases pretty much all the progress Ichigo made from the Arrancar arc onward.