““So in the MWI, the problematic quantum jump is just transferred from the object under observation to the measurement apparatus. The MWI shuffles the two outcomes off into two different "parallel universes" like a criminal attempting to hide the evidence of a crime, but it is clear that, as far as linearity is concerned, the MWI is no improvement over the existing quantum measurement problem — despite the claims of its advocates. The same cannot be said for environmental decoherence which remains perfectly linear throughout the observation process.””
