Interviewing is surely bound to lead to better or fairer results than relying on paper alone
Why do you think that?
For example, most universities now mark anonymously. When this was brought in, the average marks for women and BME candidate increased. This happened even though the majority of staff believed that knowing the student made no difference.
There are also examples of when identical applications/CVs are sent for job applications and discrimination is shown to take place. Removing demographic information when shortlisting has found to increase the numbers of minority candidates getting shortlisted, but not the numbers being appointed.
If you are interested theoretically try reading Bourdieu on cultural capital or Bernstein on restricted and elaborated codes. Both offer good explanations which can be used to explain why interviews can be so problematic.