The leverage interviewers have is that they know if the candidate can't find a job, that at some point the candidate won't be able to afford rent/mortgage, food

The leverage interviewers have is that they know if the candidate can't find a job, that at some point the candidate won't be able to afford rent/mortgage, food, clothing etc. That's a desperate position for a candidate to be in and it puts employers in a position of absolute power. With that type of game it's inevitable that you will see anti-social interview techniques. It would be a sign of high character if an interviewer didn't power trip over a candidate. The changes that would alter that dynamic is either that society should find it acceptable for people to live out of a tent and ask for donations from strangers or guarantee basic needs to all its members. Both of which are socially and politically untenable because it would disrupt the power structure of those well regarded and politically connected business that benefit. So I expect zero change on this issue in perpetuity.