And even if, for the sake of argument, they legitimately did ask about your personal life instead of your work life... you normally wouldn't answer any of that. (In fact, it could very well mean the end of the interview, from the interviewee's side.)
That's vastly overstepping commonly accepted boundaries. Sure, some surface level smalltalk is normal and expected: "Any hobbies? Ah, you like hiking? Nice. Where do you like to hike? Oh, I did that, too. Might I suggest hiking there and there? I bet you'd like it. Anyway, moving on!" Common ground helps conversations flow.
But an employer asking about your personal relationships? Your needs, fears, and desires outside of any technical context? (My needs, fears, and desires from compiler toolchains are totally within scope.) Your traumata? That's a level of intrusiveness crossing into "rude" territory. They have no business of asking.
>Your traumata? That's a level of intrusiveness crossing into "rude" territory
OP didn't say that, he said "hardest day of my life, my biggest life challenges" and then characterized it (his opinion) 'similar “trauma-baiting” questions'
asking a young person (I don't know that he was young, just saying) "what was the hardest day of your life" is a pretty standard question. Like on a college application, they expect you to answer it. Young people often don't have enough other experience to fall back on, and in a context in which you are expected to make yourself look good, the filter that is expected is to emphasize something that you were successful/resourceful at.
Some good points. Just a heads-up about something interesting I heard/read in training...
"Innocuous" icebreaker questions about hobbies, the weekend, or whatever, can be surprisingly problematic.
The questions and answers often inadvertently imply things about family status, religion, physical ability/disability, socioeconomic class, age, heritage, etc. that interviews are supposed to steer clear of.
For me, this was best illustrated by one of the https://www.linkedin.com/in/lornaerickson/ funny video skits, in which the interviewer character was using "innocuous icebreaker" chat aggressively to try to extract information all over the no-no list of things you aren't supposed to ask.
(Then the skit was funny again, after the fact, when I was in an interview with some barely-out-of-school founder, who was intentionally doing one of the things from the skit...)