Similar Topic:
Here is a statement from Prince Harry (The Telegraph) about leaving those details out.
“It could have been two books, put it that way. And the hard bit was taking things out. There are some things that have happened, especially between me and my brother, and to some extent between me and my father, that I just don’t want the world to know. Because I don’t think they would ever forgive me.”
Harry also mentioned that he had several zoom meeting with his ghost writer Moehringer. During those session, he struggled about what to keep and what to leave out.
Source: Yahoo