Feedback on just a resume with no prior connection is pretty much not going to happen. The number of resumes submitted is generally way too high to look at a resume long enough to write anything worth sending you.
Feedback on interviews can happen, but in my experience as an interviewer, when I've given feedback, candidates want to rebut it. That doesn't feel like a good use of my time, so I won't entertain requests for feedback anymore. For a very few candidates, I have reached out to the candidate to provide unsolicited feedback, like if they did pretty well on my interview but were missing some fundamentals and did poorly with the rest of the panel, and some guidance on things to study for future interviews would help them on future interviews; or they weren't a good candidate for the open position(s), but they seemed like they could do well in a different type of position.
I think the risk of it turning in a tedious back and forth / rebuttal that you touched on is a big reason in addition to the liability / risk aversion etc.
If you build a bit of rapport with your HR contact / recruiter / interviewers and mention that you'd appreciate feedback either way during the process, realize that maybe it might not end up being a fit now but maybe down the track or that you might have other referrals for them, etc., then in my experience you can actually get some reasonable informal/verbal feedback a lot of the time.
If you treat it as an entitlement and don't demonstrate that you understand their concerns, less so.
That makes sense. I guess I was only considering what my own response would be to receiving feedback. I think I'll just change my approach to just trying to articulate genuine appreciation for the opportunity to interview in the first place, and see if that sparks any love my way.
Feedback on interviews can happen, but in my experience as an interviewer, when I've given feedback, candidates want to rebut it. That doesn't feel like a good use of my time, so I won't entertain requests for feedback anymore. For a very few candidates, I have reached out to the candidate to provide unsolicited feedback, like if they did pretty well on my interview but were missing some fundamentals and did poorly with the rest of the panel, and some guidance on things to study for future interviews would help them on future interviews; or they weren't a good candidate for the open position(s), but they seemed like they could do well in a different type of position.