There are ways to richness or being poor that you need hard work to ulter and that is destiny. It is destiny that makes certain things go the way they go and no matter your effort, you are neither here nor there and someone with little or no effort succeed in that which has been difficult to achieve. So some people are destined for certain level in life and the book read is just to help those who are struggling in certain challenges to keep moving. Perhaps Elon musk and warren may be destined for such financial levels they have attained and any little effort takes them higher.

Forget about the notes, don't peep into them because they have a grace different from yours and whatever decision they took worked for them because of the grace that is different.

We are all different, don't be wasteful, guide your finances and follow your plans. Things written on books are not always the way they are, reality changes and circumstances are different. The Economist are not rich or super rich because they wrote phrases and hypothesis.