Yes it's a serious upheaval to be separated from your family and country, but equally, the RF are hardly typical. William and Harry both attended boarding school and spent their school holidays travelling between their parents' homes where they were partly looked after by nannies and security staff. They spent Christmas and Easter and part of the summers with the rest of the RF who move between Sandringham, Balmoral and Windsor. They were never in one place for long. Who knows how securely they were "attached" to anyone?
And both of H & Ws parents had seriously miserable childhoods.
Charles was four when the Queen was crowned. Six months later his parents left him with his grandmother for a six month tour of the Commonwealth. Then he was bullied at Gordonstoun. I think he had a difficult relationship with his parents. And then there's the dawning awareness that you are the heir to the throne.
Diana's mother Frances Shand Kydd was only eighteen when she married Johnnie Spencer who was thirty I think. So not an ideal scenario from the start. And Frances was under dreadful pressure to produce an heir and suffered the loss of John, a baby boy, who died a year only a year before Diana's birth. Diana witnessed , by all accounts , the really vicious subsequent breakdown of her parents' marriage and her mothers loss of the ensuing custody battle. According to Charles, Diana went selectively mute when her mother left the family home, and used to sit on the door step waiting for her to return.
So Harry isn't lying when he talks about negative parenting patterns. And of course suffering the loss of your mother as a child is not something you ever recover from fully.
Despite all of the above, the problem with blaming your parents in your thirties is that you haven't completed your own parenting yet and there's no guarantee that , despite your best efforts, your own DC won't find you lacking in some ways, or unexpected events won't upset family life . I think it's wiser to wait until your own DC are young adults before you judge your parents' performance, and certainly before you broadcast that judgement to the world at large.