One last thing, I enjoy these puzzles more than most, but I find it curious that an industry as data-driven as computing has never systematically evaluated its

One last thing, I enjoy these puzzles more than most, but I find it curious that an industry as data-driven as computing has never systematically evaluated its hiring procedures. I suspect it's because only the largest companies could risk running two types of interviews, one with puzzles and one without, hiring equally from both, and then look at the data later. Even there, though they could absorb the hit, if they're wrong, they'll have made a bunch of low-quality hires...