We effectively have the whole cat thing going on because the alternative is pilot wave. but that means that a quantum even on the other side of the universe can

We effectively have the whole cat thing going on because the alternative is pilot wave. but that means that a quantum even on the other side of the universe can have repercussions here on earth "instantly", and that was not something physicists were happy to contemplate. Crazy thing though is that the "holy" double slit experiment can be replicated using water and drops of oil. Set a wave going on the water, and then add drops of oil (particles). What you get out the other end is an interference pattern even though each drop only travel down one slit.