JAGR

Of course not! It's a staffing issue. All the servers are too busy trying to sell reservations to arriving guests during embarkation! 😉

Well, now that you clarified point of origin, you are not impacted by PVSA. OP was initially talking about leaving an MSC ship early. Obviously, that was not MSC for Vancouver to Hawaii. Most likely NCL, I would guess. In this case, I would bet that there may not be restriction under Canadian law (worth checking, I would think), so it would be up to the cruise line to decide. I'm assuming in your examples from the transpacific cruise that the denial was from the cruise line itself. As you well know, what one line may giveth, another may taketh away.

To clarify, in the US, it is the government, and not the cruise line that determines the policy. Any ship registered in a country outside the US (almost every cruise line!) must employ a closed loop system, beginning and ending in the same home port (with limited exceptions for a repositioning sailing). As such, passenger count must zero out at the end of each "cruise." This requires that you clear customs and immigration, so you must leave the ship, if only for an hour or so. Again, not MSC's choice. It's imposed on all US- based cruises. And yes, it doesn't matter if you have a 14-day cruise or a true B2B. You will have to get off the ship between sailings.