Okay, so I am no expert in this field, but would like to acquaint myself more with quantum mechanics. As I understand it, the collapse of the wave function according to MWI only appears to occur, when really the observer is copied into as many different histories or worlds as there are possible outcomes for the event, therefore seeing only one and wondering why. Also as far as I know, worlds only "split" when a thermodynamically irreversible event occurs. But what I am asking is can't the wave function collapse be real and not just apparent? Can't the wave function collapse be due to an interference and not involve going beyond internal causation? I would be very happy if you could shed some light on my question. Thank you.