Any actual application of QM still requires the Copenhagen approach.
You can derive practical usefulness of Copenhagen approach from MWI without postulating reality of observables.
I never actually heard any coherent arguments in favor of reality of observables. If we giving up on minimizing complexity, why not go all the way to the original intuitions and say that Spirit of the Forest shows you the world consistent with QM calculations?
And to avoid misunderstanding: MWI means wavefunction is real, but worlds and Born rule are just arbitrary approximation.
You can derive practical usefulness of Copenhagen approach from MWI without postulating reality of observables.
I never actually heard any coherent arguments in favor of reality of observables. If we giving up on minimizing complexity, why not go all the way to the original intuitions and say that Spirit of the Forest shows you the world consistent with QM calculations?
And to avoid misunderstanding: MWI means wavefunction is real, but worlds and Born rule are just arbitrary approximation.