From Cunard webpages re Grills Terrace.
Take pleasure in the sweetness of doing nothing, whiling away hours in the beautiful Grills Terrace, exclusive to guests of our Princess and Queens Grill Suites. Accessed with your suite room key, this peaceful space features two infinity hot tubs with a view out to the horizon, as well as an array of different seating options, ideal for sunbathing with a book or enjoying a glass of something cold and some nibbles. Attentive waiters are on hand to attend to drinks orders and other requests, and to ensure that your time spent here is as idyllic as possible. Found in a central location, the Grills Terrace is a superb option for relaxing after lunch, before heading back to your suite to get ready for the evening ahead.
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If this is open to all, without any kind of card access, it will become a bun fight for a seat. An appealing area with infinity hot tubs, who wouldn’t want to be there?
I for one, would be extremely annoyed if that does happen, after the huge premium paid for PG/QG.