I spent > 2 years of my life doing a face-to-face technical interview (ramping up the staff for a prior startup) literally every day. I've also been a hiring ma

I spent > 2 years of my life doing a face-to-face technical interview (ramping up the staff for a prior startup) literally every day. I've also been a hiring manager for a large tech company. I've given a lot of interviews. The problem with interviewing is simple: all you can determine during an interview is whether the person is good at interviews. That skill is not necessarily a good indication of doing well at any given job (especially with software engineering). The "constructive feedback" would be at best, superficial, but more likely, it would be based on the "blink response" of how the interviewer perceived you as you walked through the door -- so it's not only dubiously-based advice, it's advice that most people find hard to deliver. The large tech company also explicitly told managers not give negative feedback due to legal reasons.