I don't know, i think the best questions are the ones where candidates fully understand what is being asked about them. If they aren't able to self-assess did they really understand the question?
Candidates walking away pissed is itself also a problem. A significant percentage of candidates avoid buying from companies they're rejected from [1]. They also love sharing their poor interview experience with future potential applicants.
> A significant percentage of candidates avoid buying from companies they're rejected from [1].
When rejected, or from an otherwise negative experience.
It's not necessarily negative emotional associations. Usually it's that I picked up on signal that the company has serious problems -- either overall, or with a key person -- which suggests I shouldn't depend on the company as a vendor.
What you want is to prevent floundering death spirals. They need to understand the criteria, but if you need to hint and nudge them, they need to not feel like that means they’re bombing. Of course, you can absolutely do that in a bug squash interview, but my point is that it defeats this claimed advantage.