Einselection (https://en.wikipedia.org/wiki/Einselection) is supposed to be the "additional structure" already present in the universal wave function that doesn't need to be added by hand (which Demystifier hasn't seemed to address) and the most powerful counter-Einselectioner is Kastner. She argued Einselection is not even enough and can't take off. Do you have any critical reasoning or argument that can counter Kastner?No. I believe (but cannot demonstrate) that the necessary "additional structure", that allows you to pick out the alive/dead basis as the one that is physically relevant, is already present in the universal wave function; it doesn't have to be added in "by hand".
When I'd share about Einselection in a hall telling how it can select the Preferred Basis that doesn't have to by added by hand. And there is someone who would mention Kastner arguments. I want to be ready what to say.