No they do not and for that very reason we should abolish the monarchy. It is nothing but disappointment and indifference from here on. Go out on a high note I say. It doesn't have to be in the French style, but it also doesn't not have to be in the French style.
William and Kate seem to be following in the Queen's footsteps though - they keep their head down and act dignified. He's the one who's next in line, so the antics of Harry+Megan don't count for much. After all the Royal Family has always had some characters who are more dramatic than others, but people judge it mostly by who sits on the throne.
I do not find anything dignified about William and Kate either being bestowed a title due to the happenstance of the sequence and gender of one’s birth.
Harry and Megan are capitalizing on their circumstances, as are William and Kate.