I think being rich usually kills motivation because very few people have positive dreams, people are usually motivated by necessity. Take necessity away and you got yet another lazy upper-class cokehead "party animal", with few exceptions. There is a very fine line of middle-classery to walk, to be rich enough to throw resources at your goals, but poor enough i.e. "staying hungry" enough to actually have goals.

For one, this is a very complex claim, that I think is in some ways contrary to the evidence (mental and physical health correlate positively with socioeconomic class). But besides that, just on a sort of ideological ground, I have to disagree with it. People often claim that things like war and death are necessary. Let it be known that neither is scarcity a necessary evil. But that doesn't mean that we can't experience challenges, continuously improve ourselves, and live by our own strength.

What you say about the soft skills are true for class but not money. As they are not the same thing. For example people who have class but not money are librarians or schoolteachers. Growing up as a child of librarians or schoolteachers would mean limited means but having all the right soft-skills. I think I may be using "class" a bit unusually here, largely I mean "a culture of intellectualism" because working-class culture does not have much of that. People who buy their kids books for Xmas. People who are used to their kids demanding books for Xmas. Basically I mean a "body person" vs. "head person" dichotomy here, as virtually all working-class people tend to be body people, sex, food, fighting, sports, and while many rich people are body people too, there are more head people and thus it gets associated with class - but not necessarily with money.

I would agree with this but use different words, note the risk of generalizing from a small amount of anecdotal evidence, and rip out all of the causal implications because I don't actually know what is doing what there.

Basically my point is, having soft skills from class / intellectualism but retaining the motivation of low money seems to be an ideal combination, which I would roughly define as librarian parents or philosophy professor parents.

Once again, I disagree with this final conclusion on ideological grounds. Scarcity is not necessary.