Author here. I am aware of the excessive simplicity, but the 60/30/10 thing is deliberately unsophisticated to make it easier to apply and easier to reason about. My goal in writing this is less about hustle culture and more to consider the asymmetry of our own initiatives: everything matters in different ways, with varying degrees of cascading effects, with varying levels of immediate accessibility. I find this paradigm an effective means of considering what I have going on.