At the end of the day they are are all human, each of them will have their own traits, with the added pressure of life in a goldfish bowl. It is unfortunate that they are not permitted the privacy to work through their own issues .
The bad tempered prince , who is treated like a child by the wife to lift the mood, is not a new claim, it has been said about Duke of Windsor, Charles, Harry and now William. Maybe it is a family trait or maybe the writer needed to find new material so revamped old stuff.
As I said they will have their own characters, with a mix of a family trait thrown in.
If they were the Windsors from along the road nobody would bother that one of them has a bit of a temper,
I might get this one from the library to read, I have bought enough royal books.