Wolf, I think what people mean is the general feeling that royal marriages shouldn’t end in divorce as much as they have been.
You pointed out that three of the Queen’s four children divorced their first spouses in the 1990s. That is enough to give the impression of ‘a lot of recent divorces’
True, statistically, their divorce rate may be less than the average, but that’s not under discussion.
In any case, of the last, say, 5 royal (first) marriages, how many ended in divorce?