[Apocryphon]

"A rejected candidate should know unambiguously why they didn’t get the job."

I'd have to say that's my favorite thing about this process. All too often applicants go away with no idea about what exactly why they weren't a good fit. If someone gets rejected, the least you can do for them is to tell them how, so they can improve themselves.

[EvanKelly]

I know companies and HR have been trained to not answer these types of things based on potential legal ramifications.

I've had luck emailing after an unsuccessful interview and saying "Thank you for the opportunity. Informally, is there anything I can work on so that I could be a successful candidate in the future?"

[atom-morgan]

Exactly. If the team just couldn't see me fitting in to their group. Fine. No problem at all. But please tell me so I don't lose sleep thinking I may have bombed the technical interview.