C3 AI Data Science interview questions

First they gave online challenge and then telephony interview. After that they scheduled Skype interview with 3 people which lasted 3 hours - All fundamental machine learning questions and a screen shared coding round. Difficulty level was good and is easy to fumble if you are not theoretically strong. Another call scheduled for another round of 3 people skype interview. Another 3 hours of behavioral interviews (focused on the work I had done). They told me that there would be another round with CEO which will be the final round. Even though all the interviews went very well, they send me a reject next week. Can you believe it! So after giving 8 rounds of interviews in total(including coding challenge) and 8:30 hours spent interviewing with this company (excluding the number of hours I studied preparing), someone would expect at least expect valid reason from the company. They gave me most vague reason for not selecting me which does not even make any sense - "As for feedback, the team thought you were technically up to par, however there were just a few others in the pipeline who had a bit more experience in certain skills that could be applied to a few projects we are planning." I thought experience part is taken care of in the screening process itself. If they did not think that I was experienced enough(which is printed on the resume), why to bother even engaging me in the process? Thank you C3 for wasting my valuable time. Please at least read people's resume before engaging them in the interview process.