I call bullshit on the idea that industriousness is entirely learned. You can definitely improve it but research shows a significant part of it is genetic.
Personality traits account for something like 5% of the variance when it comes to life outcomes. Their usefulness comes from mostly analyzing huge groups of people and their differences in behavior than to be used as an individual measure. Most people can become significantly more or less industrious if they try. The same goes for other traits. In fact, I would say that part of your experience in life is nudging yourself more to the opposite side of what you're genetically given, i.e. if you're too industrious and too disagreeable, learn to be less (it's not so good to be hyper-competitive and hyper-focused all the time).
I guess my argument is that most people can learn to do a lot more work than they are. Not everyone can sustain 100+ hours per week but someone working 40 can probably get a 50% improvement. The most significant change in my life occured through simply working more hour and developing habits to make those hours efficient.
