It just doesn't bring anything new. It was obvious it has to work this way, since non-elementar particles can be in superpostion. If we assume that the time is

It just doesn't bring anything new. It was obvious it has to work this way, since non-elementar particles can be in superpostion. If we assume that the time is still going for systems that appear to be in superposition for the outside observer, there doesn't seem to be any other explanation other than superposition being relative - the observers in the system still experience time as usual, and the superpostion only exists for the outside observer.