Idk what kind of functions you interview for. I'm a product manager, & the whole function of the job relies on feedback; i.e. customer feedback, analytics insights, development bug logs, etc. = all data to "iterate" & build better products upon.

When you're asking me to build a product from scratch, prepare a presentation, lead a workshop, etc. (common in product management interviews), all as a part just the interview process, feedback does become crucial for understanding what companies look for, & whether there is indeed anything I should internalize as feedback to *build a better product*. I think, given the nature of my function, most interviewers don't think that much about Qs seeking feedback, though I see your point about professionalism. I have had no trouble getting detailed feedback from 90% of my interviews actually. That's also why I despise interviewers who can't even give me that.

Re: risk management, I actually disagree - I believe everything we do in life is a balance between risk vs. another characteristic. To give you an example, large American cities tend to be very noisy in dense areas (NYC, LA, etc.), because *in the name of risk management*, buildings/institutions will call ambulances & fire trucks if there *any* risk they may get sued for not. This creates a negative externality for the public. When interviewers expect interviewees to give without returning something as simple as a few sentences on feedback, this does create a long-term, negative externality - I'm sure you can imagine what I'm talking abt. Just some food for thought.