That was the exact policy on my cruise with MSC cruise line in September, and same with RCCL cruise in November, and exactly same policy on my next 2 cruises coming up in January and February. My wife and I did not find it hard to comply.
No one checked how snug our masks were. We kept them loose for better breathing. During stage shows with lights off, our masks were really loose LOL.
‘We kept them loose for better breathing.’
you win the ‘Missing the Point’ championship trophy...
Obedience to your masters is a very bad habit.
You need to bend them to your will, not submit to theirs.