Why is it important to pick a narrator carefully when planning to write a narrative?

The narrator tells the story, but it is the reader who controls how events are imagined.
The narrator's point of view determines the sequence of events.
The narrator must know what all characters think at all times.
The narrative will change depending on the narrator's tone and point of view.

Question

Why is it important to pick a narrator carefully when planning to write a narrative?

 The narrator tells the story, but it is the reader who controls how events are imagined.
 The narrator's point of view determines the sequence of events.
 The narrator must know what all characters think at all times.
 The narrative will change depending on the narrator's tone and point of view.