Devil's Advocate: * Encourages a hyper-competitive individualistic mindset which in some cases, while producing individual excellence, can come at the cost of worse overall outcomes for everyone within the community you operate, ironically including yourself. * Places the responsibility (and the blame) for individual outcomes completely on the individual, without mention of external influnces, like health crises, educational opportunities available, social networks, luck, etc. * Does not account in any way for those who have devoted themselves to a singular subject for a long length of time and not succeeded professionally. I sense a heavy double standard here. When people who operate like this do become successful, they retain or grow their passion for their craft, and it appears like a symbiotic confluence. But when they fail to become successful, they can become desititue, and lose or blame their chosen craft for the outcome they face. It's just as easy (even more easy, actually, in many fields) for this outcome to happen (though it isn't mentioned), and for them or others to, in 20-20 hindsight, label their starting passion for their craft as "misdirected". * This isn't the most substantial criticism, but the choice of what craft to pursue is one directed by some level of "interest" anyway, even if it isn't your first "passion". Everyone chooses the path they want to take as some acceptable combination of that they're "passionate" about and what they believe the ultimate payoff of that path will be. The author is simply urging us to choose relatively less abstract/more practical paths than we've been culturally programmed to want. * The requirements for happiness outlined in the book summary are multi-variate, and it may be impossible for a person to attain what they feel is sufficient amounts of all of them simultaneously for the person to feel professionally fulfilled. * This is an idea tailored for those who will eventually specialize in a topic (combined with the fortuitous continued demand for that area of business) to such a degree that all the happiness.. things.. fall into place. It is not an idea that will work for those who want to be average, or feel they can only attain not-world-class levels of mastery in any particular subject. * Along that line ("fortuitous continued demand for that area of business") of thinking, as the labor force and technology become more and more specialized, the time it takes to master a topic will only grow. As there may be many years before one see the first profits (not progress, that'll happen along the way- I'm talking about profit) from the pursuit, there may be few or no short-term indications that the pursuit is worthwhile, in the sense of leading to profit. Exploring existing markets for what skills they currently value and working towards them may also not be enough, as entire markets and industries are revolutionizing and remaking them faster than ever before. Predicting the correct future job opportunities and having the ability to learn fast enough to train into them may slowly grow more and more difficult, for the reason of accelerating technological change. * Adopting this "craftsman" mindset instead of the passion mindset and being willing to practice the hard things for years without payoff requires start-up capital in a sense. It requires you have the resources to do it. The outline mentions this (?) that "mission capital" is required, but doesn't say where it needs to come from, other than implying it might have to start off small enough at first to be sustainable. * Some of the other parts are really about "time management", i.e. how one is supposed to successfully organize their time/habits to be successful once they've decided on a particular action they want to take as part of the overall path ("how" to do, not "what" to do).