Convoy Full Stack Software Engineer interview questions

Had a great coffee chat with the first person - that went 25 minutes over. I was legitimately enjoying the conversation and wanted to be gracious, so I didn't rate that a problem. Then I was assigned a 2-3 hour homework problem. I submitted it and got feedback - any developer will groan - about opinions on how I broke out classes and how I used comments. Very opinionated things that could easily be praised across the street or even talking with another person on the same team. I spent 3 hours writing a solution, but you couldn't bother to call me up and chat about what I did for 15 minutes before failing it?