Earlier quoted context omitted.
Guilty as charged :-) As an interviewee, I have, more than once, thanked my hosts for their tea and cake and left early when I detected that the interview was turning into a chat. Would a collegiate interviewing model not work better for an intellectually driven organisation like Google? Each team interviewing for their own positions, but with some form of 'tenure track' process for the longer term?
I'm really surprised that's not how it works at Google, both from their perspective, from the perspective of the candidate. I would be extremely hesitant to interview or accept a job at Google if didn't know what I'd be working on, and it seems like you only find that out when you show up the first day.
You are also going nowhere for a long, long time.