Uber Analytics Manager interview questions

I applied on the uber website, a day later I received an email from recruitment asking me to do the two hour analytics test. I did the test and got a response the following day that I did well and that recruitment would like to have a telephonic interview with me. I had two interviews with Recruitment. One was over the phone and the other was via Skype. Both the interviewers asked the same questions. I was then told that I would have 4 interviews onsite. All 4 interviews were very similar. They all asked the same questions. I don't understand why i needed to have 4 interviews instead of a panel interview with 4 people.

Round 0: Screening with the recruiter, which seems almost as good as an interview. The recruiter did a great job at explaining the role, and expectations. Also, was great at getting me excited about this job. Round 1: Phone interview with the hiring manager, who spent a good deal of time in explaining the vision of the team, and painting a picture of the expectations from an otherwise ambiguous role. Felt like a very detailed conversation with all the right questions asked and answered. Round 2: Case study Round 3: On site. Three interviews with a wide panel. The hiring manager stayed up later to answer any doubts. Round 4: Interview with the VP.