It's one of the big advantages of technical interviews. You don't have to rely purely on subjective human judgement.
And yet (aside from mega deal-breakers, like clearly overstating competence in some category) that's pretty much what hiring decisions come down to: "Are they for real? Can I rely on them? Will I get along with them?" -- the battery of contrived, essentially "objective" assessment that get thrown at candidates notwithstanding.
I've interviewed in several foreign big companies in Japan. After enduring multiple interviews spanning 2 to 4 months (compared to 2~4 weeks in Japanese companies), not once did I get any specific feedback. In one particular case, during the process, I asked HR for the contact details of 2 of the technical interviewers and they refused; I had to send my questions via HR.