cass - doesn't seem you have ever cruised on a large elegant cruise ship or are not observant - I cruise annually portable dvd players abound either rented from the purser or brought on by the user - they are most used during sea days in the common areas or in the rooms as available tv is suspect - sorry read last sentence, you haven't cruised yet - enjoy - sdr
Someone who cruises regularly may want to confirm it, but I don't recall seeing a TV in the stateroom. (Of course, that may vary from line to line.) Seems to me that some folks might find in-room video entertainment (especially with some content genres) a worthwhile alternative to group viewing in a theater setting. After all, "something for everyone" seems to be the main gimmick being pitched by major cruise operators lately.