Maybe large ships are not vulnerable to attack as small ships and don't require the stringent safety measures?
Also, given that Seabourn at least has a couple ships doing these legs, I tend to see Med - Asia as more repositioning than legs of a World Cruise. Could be for one ship, but not both....
Now I wanna go see what other lines offer cruises through that area, if any of the mass markets are doing it. I typically see the mass markets who do Asia repo from Japan to Alaska but this isn't something I've looked at before....