‘One world’ Interpretation of quantum mechanics

“Schrodinger’s cat is in a superposition of 2 states and then when you look at it YOU are in a superposition of 2 states.” IS WRONG!

Actually there aren’t 2 worlds, there is a single world that is in a superposition of these 2 (or many) states.

This is Roger Penrose’s idea of how many-worlds interpretation could work for quantum mechanics. I would love to hear what Sean Carroll says to refute this view, while he, Roger and many others fight the prevailing fashion, faith and fantasy of the misunderstood Copenhagen interpretation of quantum mechanics.