receiving feedback sounds good on the paper, and i understand how it would be helpful and ideal to receive it, but its just not how the real world works, as there is no business incentive to provide the feedback.

i would say in tech its fairly easy to establish hard skill competence during the interview. the remaining portion of why person gets hired is more fuzzy and is much like dating. they like you or they don't. asking why not rarely leads to any response or a meaningful response, because a lot of times they don't even know why, it might just be a gut feeling thing.

i wouldn't obsess about the outcome, as long as person is working on themselves in all areas and keeps trying, success will come.