What do you think about cases in which is very hard to get started? For example, create a new project with React and Webpack? It is now easy thanks to create-react-app but about a year ago was a nightmare and the online documentation was not easy to follow for beginners.
I think, if the main documentation for a tech/library is not good enough, then that tech/library is not good enough to trust/use.
ReactJS documentation is great since day 1, i've done many projects with React without any learning materials.
Rails is another example for good documentation and ecosystem documentation (most of documentation for Ruby gems is superb).
And many others ... too.
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