Intelligent people are more likely to think on the consequences when deciding to have a child. But there is a prisoner’s dilemma type of situation here:
One reason smart people forego reproduction is because they might feel children make them more unhappy overall for at least the first few years (a not unreasonable assumption). Or simply because they are not religious (smart religious people do still have lots of children) As a consequence, in 20 years, the average IQ of that society will fall (bar some policy reversals encouraging eugenic breeding, or advances in genetic engineering), as only the less intelligent breed. Since, all other things equal, smarter people perform better on their jobs, the average quality of services provided in that society (both public and private) goes down. So in the end everyone becomes more unhappy (even though unhappiness of a childless smart person resulting from societal dysgenics may not outweigh the temporary unhappiness from having a child)
I think that it pays to be rationally ignorant. It is an economic fact that the more people specialize, the more they get paid and the chance of making a significant contribution in their particular field increases. You can’t achieve your best in being a doctor if you spend valuable time reading textbooks about Western philosophy or quantum computing instead of reading textbooks about diseases. There is a saying capturing this thought: “jack of all trades and master of none”. Sure, there are some fields such as AI at the intersection of many sciences—however, I doubt that most people on this blog (including me) are capable of handling that much information while producing new results in the field in a reasonable amount of time.
So, instead of reading the intro textbook of each field/science (I bet there are more such fields than anyone can handle in a normal, no-singularity lifespan), the best approach for me is to learn a little about each field in my free time—just enough so that I will not be ignorant to the point of making serious mistakes about the nature of reality, and sufficiently easy on the mind so that I maintain the processing power for the main work: digging as deep as possible into the field of my choice.
So, I disagree with the author and think that Teaching Company courses are more useful than textbooks… except for the textbooks pertaining to your chosen specialty.
There is a real danger in becoming more absorbed with the exploration of rationality and science than with focusing on, and excelling in, your own field. I myself am guilty of this.