There is a formal night poll in Crystal:
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While formal attire discourages some it also encourages others.That's why there are so many "niche" cruiselines. For us, we choose Cunard as they stress the old style elegance of ocean liner travel. Oceania has great food & a casual country club atmosphere. No real formal nights, but no boosecruise casual either. Celebrity is kind of a blend of both somewhat formal with a lean to casual dress as well.
We are all fortunate to have choice when it comes to cruising.
If we all had the same interests and likes there would be one cruise line and we would all eat and dress and drive the same cars and root for the same sports teams and read the same books and life would be rather boring.
I know several people who would not sail on certain cruise lines because ships are too large or too small or too casual. Is it really necessary for everything to be the same.
Choice is still good.