I'm sorry if I wasn't clear; I didn't mean to say that all LC questions are irrelevant. I was just asking if you're claiming that no company uses LC questions which are irrelevant. Because if you are, that seems like a pretty difficult claim to prove given all the stories out there on every company review/discussion site like Blind or Glassdoor.
And my "implement a quadtree" example was hyperbole; again I'm sorry if you didn't recognize it as such. I do suspect we have wildly different definitons of what questions qualify as "relevant to the position," though, so I'm not sure how far we're going to get in this discussion.
Because the interviewers themselves typically have wide latitude to select the actual question, no, I don't think such a thing can be claimed. But I'd say the majority of questions asked are reasonable ones that can plausibly be solved in the timeframe and the majority of interviewers I've observed from that side of the table have not expected perfection or wanted their candidates to fail.
I don't think I (nor most others commenting here) were claiming that the questions couldn't be solved in the timeframe, that interviewers expected perfection, or that they wanted candidates to fail. So I'm not really sure why you brought that up.
And my "implement a quadtree" example was hyperbole; again I'm sorry if you didn't recognize it as such. I do suspect we have wildly different definitons of what questions qualify as "relevant to the position," though, so I'm not sure how far we're going to get in this discussion.