I watched a jane Mcdonald programme where a passenger said she put an out of order sign on a washer so she was guaranteed one would be free to use,On our cruise there were several out of order and it just made me wonder.
Open dining is turn up at a time that suits you mit could be 8pm one or 9pm the next rather than the set times or on the myvoyage app place a booking and they will notify you when a table is ready.also you can choose the size of table you would like