I was always told the reason for the 22L offset/preference from the ILS when they are doing Canarsie/VOR 22L ops is for separation from LGA traffic. No authoritative source mind, just word on the street when I was flying long haul. I always enjoyed the 22L VOR for many reasons, and would generally line up below 1000’. JFK and EWR both offered a bit of fun flying in a heavy.