IBM Machine Learning Researcher interview questions

5 tedious zoom interviews, in which they asked me the same questions, and I kept repeating the same answers over and over again (tell me about a project, and what are you looking for), until they rejected me after the 5th interview. I don't understand why they don't do just 1 interview with 5 of their guys at the same time if they're gonna ask the same questions, instead of wasting candidates' time like that. Also, given the fact that I was literally repeating the same things over and over again, why would they stretch it to the 5th interview to reject me? Just reject me from the 1st one and save both our times.