Why? A requirement to have a negative test as many as 48 hours prior to sailing is an ineffective way of stopping the virus from getting on-board. If they were serious about it, Disney would require a negative result from a rapid test administered at the port (and on their dime). Someone could have been exposed 72-96 hours prior to sailing, test negative at 48 hours, and then have a full-blown Covid infection while on a ship, particularly cruises longer than 3 nights. Members of my family were required to go through this exact Covid theater on a different cruise line and still got infected while on-board.