There’s a tendency in all of us to gather useful stuff and feel good about it. To collect is a reward in itself. Article 
Why fallacy? Because ‘to know about something’ isn’t the same as ‘knowing something’. Just knowing about a thing is less than superficial since knowing about is merely to be certain of its existence, nothing more. Ultimately, this fake-knowledge is hindering us on our road to true excellence.
Until we merge the contents, the information, ideas, and thoughts of other people into our own knowledge, we haven’t really learned a thing. We don’t change ourselves if we don’t learn, so merely filing things away doesn’t lead us anywhere.