They make sure the candidate is comfortable and has room to make questions. It is a both way process to learn if the candidate is fit for the position and vice versa.

Unfair process. I was interviewed by somebody who would be my colleague if selected to the position. This person does not even care of my interest in applying to the role or my previous experience. I personally believe that being interviewed by somebody with less o more experience is not correct, this person's opinion or evaluation of the interview will not be an objective opinion. Has this future colleague the right criteria to select another person who could have a better experience and maybe could be a threat for him in his career progression or ambition within the company? Should it be somebody from HR with a neutral point of view looking for somebody with the right skills set and experience? The interviewer introduced himself and went straight to behavioral questions. It was not difficult, but it is not fair that every individual will react in different ways within the same situation and both will obtain the same result, mostly if coming from different industries and background.