Why might a writer feel compelled to write about literature? how does it benefit us personally and/or professionally?

Literature is almost an unspoken language. There are so many ways to interpret and argue with it, that it compels writers to test past arguments, inquire on scholarly findings and revamp literature in his or her own way. It can benefit us professionally because it forces us to dig into the flesh of text to figure out the message that the author tried to relay to us. Personally it can help us to strengthen our own vocabulary or writings.