The Importance of Downward Causation in Cosmology

When we do cosmology, like when you're predicting the density perturbations in the cosmic microwave background, we're not doing quantum gravity. We don't really know the rules for quantum gravity in these circumstances. The other half-assed aspect is that what do we mean by quantum mechanics? Do we mean Copenhagen? Do wemean something else with hidden variables? And maybe, although I'm not really sure, maybe downward causation is a useful idea in a situation like that.