As an English major, it is important to know what words mean. It is also important to know how to research the topic I wish to write about. For example, as a blogger, I have to do research on the issue I write about, like the Ray Rice incident or Anita Sarkeesian. I have to use research to be well informed and informed enough so that I can write enough about a topic that gives the impression that I am well informed.
I also write novels and short stories. When a certain story takes place in a certain time period, I have to research that time period and have enough inquiry to know what to look for.