As an interviewee, I would love companies to provide some transparency and feedback. The feedback doesn't have to be super detailed, just areas for improvement. This was something which I really appreciated about Facebook. I interviewed onsite a year back and later the recruiter told me "You did well in all the coding interviews but we felt that you did not display the level of competency required in System design for a senior role". That was actionable feedback IMHO and I would not hesitate to interview again.

The flip side is I hate interviewing for companies which ghost / refuse to provide feedback, especially when they give you a take home test / assignment where you don't even know a) Whether a human / engineer saw your submission b) What is the criteria being used for evaulation (especially for working solutions). The worst offender has to be Slack (though Twilio/Amazon is right up there) where they make you create a slack bot which does something trivial (play tic-tac-toe). Wasted a bunch of time to read the documentation and get a basic bot working before I got to actually work on the problem (tic tac toe). My submission was rejected and I was given no feedback / reason why