This is universal and there are studies supporting it. Most of the interview is spent just affirming the initial impression. If the initial impression is good then they will spend the hour trying to find your good points and vice versa.
Shouldn't technical interviews be different? No, not really. In general the interviewer will give more hints to people he likes and more follow up questions to people he dislikes. After enough hints even the worst candidate will find the solution and get extra points for good collaborative skills. Similarly even the best candidate will stumble sooner or later and gets a mark for being argumentative if pressured enough.
Also notice how everyone says "We care about the thought process and not if the solution actually works!". This allows for their subjectivity to reign supreme. Things like "Your solution is wrong but I love your thought process!" or "Your solution is better than mine but you didn't think things through enough before implementing it" can be said about everything.
It is of course not that hard to do technical interviews correctly, you just need to have hard rules on what to accept and what to reject, what hints to give and when to give them etc. Any leeway for subjectivity will be abused by your subconscious.
Shouldn't technical interviews be different? No, not really. In general the interviewer will give more hints to people he likes and more follow up questions to people he dislikes. After enough hints even the worst candidate will find the solution and get extra points for good collaborative skills. Similarly even the best candidate will stumble sooner or later and gets a mark for being argumentative if pressured enough.
Also notice how everyone says "We care about the thought process and not if the solution actually works!". This allows for their subjectivity to reign supreme. Things like "Your solution is wrong but I love your thought process!" or "Your solution is better than mine but you didn't think things through enough before implementing it" can be said about everything.
It is of course not that hard to do technical interviews correctly, you just need to have hard rules on what to accept and what to reject, what hints to give and when to give them etc. Any leeway for subjectivity will be abused by your subconscious.