> everyone arguing about brains and the universe is trying to justify something like the Consequence Argument

That hasn't been my experience at all, usually I see claims about the brains and universe being made from epistemic grounds, and indeed they are valuable in of themselves even if purely academic. The nature of our reality is worth discovering on its own merit, rather than just discarding in favor of saying that's not what we're really talking about (when indeed some of us are talking about that!).

All the more reason to be clear about context.