The book intends to be a revolutionary manual pairing up horse training to corporate leadership.
Monty Roberts claims to have invented a method to break horses though gentle manners rather than force. Maybe this could have been surprising in the US of mid-60s, but nowadays it is well renowned that the most effective way to start a foal is though gentle persuasion leaving to the foal the responsibility of the decision.
Same for corporate leadership: any leadership class I have attended in the past 10 years expressed the importance of trust on colleagues, of collaboration rather than imposition, of learning more than preaching. Further, any horseman knows that if you learn dealing with horses you learn dealing with people through kindness and firmness.
The whole book can be summarized with a motto: there is no teaching only learning. Thus I would have cut self-promotional claims (I have won so much, I have raised dozens of foster children, I Have helped so many people,… ) episodes impossibile to be believed in (like the mare spilling milk once close to a young MR, or MR remembering the layout of his first house got burnt when he was 18 months!!), or emotional episodes placed to impress the reader (e.g. the lady abused for years by her father, his friends, the priest, etc; a man successful despite being quadriplegic) or stretched to support the book’s theory (a young man turned into a loser because his parents were not firm enough in his adolescence).
Today the manual sounds paternalistic and outdated.