Open Source also does not mean free products and support.
As a case in point, you were giving out about 2 different pieces of open source software in this thread.
Neither of which you have to pay for. Both of which are complex system that have taken many many people hours to build. As a return, is suggesting that you may submit a PR (or even a bug, with suggestions so that the people CoreOS hires to write docs know there is an issue)