I am not sure if I understand the point correctly. I edited the question exactly to change the tone from the tone of a student asking why he needs to learn a topic to a voice that is closer to an instructor (without changing the questions). 

Are you saying that a question asked by an instructor would not get answers as good as those asked by a student? Or are you objecting to the particular way that I changed the tone? Or are you complaining about the fact that the voice of answers do not fit the voice of the question after edit?