Google Technical Program Manager interview questions

Applied through employee referral... first call with recruiter was just general screening questions, followed by 2 phone interviews. The two phone interviews are very dry. The interviewers basically read through a list of pre-defined questions and note down your answers. They're technical, one for system troubleshooting and one for project management. They will not give you any feedbacks or drilldown questions to your answers. Unfortunately I didn't answer one of the questions too well, but overall, I felt that this interview process is dumb. Why don't they just send me to one of the test centers to test my knowledge instead of sending humans to conduct interviews? There're little to no human interactions whatsoever with the interviewers. They simply read off a list of questions and note the answers regardless of what you said. They do leave some time in the end for you to ask them questions though. I guess that's the only benefit otherwise I don't see any points in these phone interviews.