nunyabidness

But you can usually call and get it (or a reasonably close cabin in the same category) back. Not the case if you booked a guarantee and didn't have a cabin assignment from the beginning.

Only risk with a guarantee is that Princess can "upgrade" you to a room they consider better but that's in a much worse location.

If he is a US citizen he can travel on this itinerary with an original or certified birth certificate and government issued photo ID. There are further restrictions if crossing into Canada from a US port (e.g. Skagway excursions that cross over into Yukon Territory) or if he is the only adult traveling with a minor on Princess.

I Googled "what time is it in Sydney" on my laptop. The result showed the date and time. Took a picture of the Sydney date/time, negative COVID test, and drivers license all in the same photo.

As others have noted, it does matter on cruises out of Galveston due to state liquor laws. This is this case in almost every US port (and out of New Orleans, where you're in state waters until midnight-ish when the ship reaches the Gulf of Mexico, but no impact to Princess since they have no ships based in New Orleans).

Not Carnival itself. When they stopped offering twice daily service the stewards had their number of assigned rooms almost (if not actually) double.

Wow. I'm pretty sure that was the entire point of OP posting the question.

Royal Caribbean does print the cabin number (leaving off the deck number in front) on SeaPass cards. In the 20+ years I've been cruising Carnival, Sail & Sign cards have never had the cabin number (or any variation of it).

How many people are you booking in the cabins? Princess (and most cruiselines) hold cabins that sleep 3 or 4 for people who need the third or fourth bed, at least until closer to sailing. You may need to search for cabins that sleep 3 or 4 from the cabin type/decks you want, find connecting cabins you want (assuming there are connecting cabins to that sleep more than 2; check the deck plans), and call Princess to see if they can book you into those at (presumably) double occupancy.

By air, yes. Driving across the border, no. There are other acceptable documents for a land border crossing.

I messaged a steward onboard whom I know. He said "No outbreak...only few cases."

And if it's a tender port, the last tender back to ship is scheduled earlier, usually 45 minutes before the ship's departure time.

Should the OBC from using a FCD show up in the travel summary of the cruise you used it on, like shareholder credit or OBC from a casino offer? I can calculate my charges reduced by the $100 FCD but there's no OBC showing.

No. Has to be sealed in its original container.

Apparently everyone, including yourself, had reservations for private tables. Everyone else wanted private tables as they had reserved, and IME the MDR staff don't ask people with private reservations to share a table unless there are no private tables available at the moment. You volunteered for a shared table and apparently no one immmediately after you wanted or had reserved one. I fail to see how the sheer nincompoopery falls on Princess.