The argument, from a neuroscientist who runs Ness Labs, is that we organise our lives around linear goals, the four-year degree, the ten-year plan, the thirty-year mortgage, while learning does not work anything like that.
Her replacement is the experiment. Instead of committing to an outcome you cannot predict, you make a pact with yourself: I will do this action for this duration. Purposeful, actionable, continuous, trackable. At the end of the day it resolves to a yes or a no.
This is more or less how Idea Warehouse already runs, so the book landed as permission rather than instruction.
The line I keep coming back to is that an experiment exists to tell you whether the thing is worth continuing. That is a different question from whether you hit the target, and a far more honest one.