CARVANA Project Manager interview questions

This is the company I spent most time to prepare for. I went through HR screening- hiring manager- take home assignment - super day consisting of 3 interviews. The interviews are cheerful. The HR is super helpful and responds very timely. I can sense the good working culture. I waited for about 10 days and then was told that they chose another candidate. I appreciate the detailed feedback. But I feel the interview process could have fewer rounds, 3 could already be enough.