I was there a couple of days ago. Not busy at all. By all means putt it on at 400’ if you want. But having that as a “Standard Operating Procedure” is sad. If my colleague wants to fly manual in JFK airspace I’m usually ok with that. Turning the heading bug and pushing a few buttons doesn’t usually overload me. That is if the situation permits. Las month I flew raw data into HKG. Its a miracle I am still alive