“seem to recall a higher proportion of infirm passengers on larger ships.”
Well that is certainly true when talking about river cruises. Some don’t even have elevators ( though there aren’t many flights).
I don’t love crowds but after 10 nts on a 700 passenger ship I felt a bit confined and like there were a lack of ( new) dining options and things to do. And I am
one who can usually easily entertain myself with a book .