Tough interview, 4 rounds, panel case study presentation. One of the interviews is 4 back to back for a 3 hour time slot. Did not get moved on after the case study which I believe went very well

Total 5 rounds + take home assignment Round 1: The recruiter seemed not at all interested in hiring Round 2: Hiring manager was nice Round 3: Straight forward questions Round 4: 4 interviews in 3 hours time slot. 1 of the interviews was a technical collaborative task but it was easy. I received an email after round 4 that they are not moving forward although I think it went pretty well. They never shared the feedback as to which part didn't go well (unlike how other companies do) All the interviewers didnt seem excited about their own work, except the VP@Product, who really took the interview well with high energy.