title: Are there still reasons to use promise libraries like Q or BlueBird now that we have ES6 promises?
body: <p>After Node.js added native support for promises, are there still reasons to use libraries like Q or BlueBird? </p>
  
  <p>For example if you are starting a new project and let's assume in this project you don't have any dependencies that use these libraries, can we say that there are really no more reasons to use such libraries?</p>