There are 2 issues with us the player being the interceptor.
First if we were controlling the characters that means at some point we would need to control adrest or axel because they were also interceptors
The second issue with us being the interceptor is that when we the player inhabit the mind of another character there is a specific goal we are trying to reach in advance like trying to learn about the interceptor as melia or helping anastasia as ren. When we inhabit other minds we don't have as much control over there actions or how they behave like we do with the mc