Omid has lost, if he ever had any, respect with regards his writing.
Some of historical information was wrong, all easy to check.
He claimed source including family members, then used tabloids stories as his back up when challenged on certain details. The Piers Morgan claims for an example.
A great deal was opinion rather than fact, as an interviewer said to him what he claimed he was writing could have been really interesting and a conversation worth having but what he produced was tabloid stuff.
It was a personal attack on individuals , in particular Catherines' journey from young wife new in to the family until now. He does not like her.
He was acting like a bully, saying how she was not a very confident speaker, well good on her for trying. A part time royal because she wants to spend quality time with her children. Does as she is told, I would put that as being respectful of others.
Even his use of words in the interviews were misleading,' I did not sign off a book with names in it'. He was diverting attention, did not want to take responsibility for his actions. He obviously did issue something at some point that included names. He is better with words and the nuances when he is being interviewed than he is when writing a book. Maybe he should have used a co author on this one.
He has not done Meghan and Harry any favours, whether they helped or not he is giving the impression they did.
Regarding Charles letter, this would have been a personal hand written letter not something sent to the typing pool. Charles is known for his spider like writing a quick glance would not have been enough to work out what was in it.
He might slip in to the background now, although he will claim a best seller, even if it is , it does not make it a well written book.