That question has always intrigued me too . From my non expert position , I couldn't see the logic of building a parallel runway 1500M shorter than the main parallel when building space was not an issue . It would have provided an opportunity for true noise sharing with landings and take offs before swapped at time intervals between the two runways without any performance issues . Look at LHR , ICN , JFK just to name a few , and there are many airports around the World who have equal or near equal length parallel runways , and observe the advantages .
Dave C
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