I really hated the cases were when "no" can not be explained.
In some cases when there is "no" it comes with clear instructions like: hey you need to know v8 more or understand hotspot better and try again in 6 months, but then there were those cases where the committee was incapable of giving feedback.
I interviewed ~500 people in a fairly large (~2000 devs) company.
Interviews used to take about 6-8 hours of my week, and I was usually completely destroyed by the context switch. I remember many days when a deadline was very close, and I absolutely did not want to do the interview, but had to.
In general some days I was in good mood, some in bad mood and even though I tried to make the interview as objective as possible, I am absolutely sure I failed. Keep in mind, one interview has 5 interviewers and guess what they had bad days too.
From those 500 interviews, I was certain for about ~5 cases, for the rest I could not say if it was my fault, or the candidate's fault that the interview went south, in that case I pretty much voted as the majority was voting.
I still feel very bad about people's livelihood being decided in such shitty process, there is absolutely no way that in 1 hour I can find out if someone is good. I knew that, my managers knew that, their managers knew that, and yet we kept going..
I feel that adding more time/people to the process only increases the variance, adding more structure to the process only increases the bias (like we get people who can pass interviews, but not do their job).
In some cases when there is "no" it comes with clear instructions like: hey you need to know v8 more or understand hotspot better and try again in 6 months, but then there were those cases where the committee was incapable of giving feedback.