From the conclusion:

> Now, to be clear, I’m not saying you should immediately refactor all your Rails applications to use monads; I’m just using Ruby as a tool to explain an interesting idea about programming, not giving you a best practice for all your Ruby code. However, it’s good to know about techniques like this! And in some cases, by applying the power of monads wisely, we can untangle nested callbacks, make parts of our code more reusable, and generally make our programs better.