Uber Research Scientist interview questions

A recruiter from Uber contacted me after being referred to my LinkedIn profile, so not sure if this process is exactly the same for all applicants. The recruiter asked if I was interested in learning more about the position and when I said yes, the recruiter put me in contact with another person in charge of hiring. We had a short 30 minute conversation, mostly information about the position. I was then sent a link via email to a "test" that I had 2 hours to complete whenever I had time. It was a 5000 word research proposal outlining and explaining what I would do to increase driver satisfaction and loyalty. This was then sent to the head of the research team who evaluates the test. I was then contacted and told the head of research team wanted to talk with me, so we set up a 45 minute phone conversation. Most of the questions were related to my interest and fit for the job, with only maybe one research-related question (what would I do if I didn't have total research control - I come from a lab-based PhD research program). A lot of the emphasis was on making sure it would be a job that I wanted to do. After that I later found out I did not move onto the final interview stage (an in-person panel interview at hq). I requested feedback and they were nice enough to provide some - said other people seemed more excited about the job than me and that it seemed I wasn't sure what I wanted to do. Left open the opportunity to get back in touch once I had figured out what direction I was heading (industry, academia, etc.)

The conversation with the person in HR was pleasant enough. He was friendly and nice and asked the usual screening questions. However, the job test included one solitary, vague question and the feedback received was equally unhelpful. The impression I got was that the department was already ready to hire someone else so it wouldn't have mattered what I wrote.