Job is rarely utilizing all your capabilities, in fact rather forces you to spend too much time on things you hate and would do differently or even not do if you weren't forced by your employers. Your advice is for people that are happy to be defined by their job, not by their accomplishments and potential fulfillment. The rest of us with some ambitions and drive have to do/study things on our own with the hope we can go ballistic on those ideas and make some part of our world better.