Why is it useful for historians to craft historical narratives?

Narrative history is writing history as a story that focuses on the chronological order of history.
There are several reasons why It is useful for historians to craft historical narrative.
1. The event in time can be better understood.
2. The key roles and relevant features can be easily point out. 
3. The actions can be easily described.And why those rather than other actions were taken.
4. What causal processes(social or natural) may have played a role in bringing the world to the outcome of interest? 

The key roles and relevant features can be easily point out. 

Thomas edison created the light bulb.