We returned home from a Ventura cruise 2 days ago, and was very interested to see that the post-cruise questionnaire had questions about our attitudes to formal attire. I suggest they are sounding people out.
On our cruise there were 3 formal nights, and although we did take the necessary attire along, neither of us enjoys it and so after the first formal night, we ate in other non-buffet venues. My observation on those nights, both from the MDR on the first night and in the theatre on the other two, is that whilst there were a good number of people who had dressed up, there were also a good number who hadn't, or had made only the slightest effort.
Time will tell and it is only my view that eventually P&O will go down a similar road to Celebrity in identifying nights called 'chic' and leaving it up to the individual to determine the meaning of chic.