I've never understood the hate that WBI get here and elsewhere on the internet. I see them the same way as standardized tests: without them, there's no good way to independently evaluate people's abilities in a way that is immune to cheating, dishonesty, or fraud (e.g. stealing someone's code and putting it on your github repo, being a terrible employee at previous jobs but just scraping by long enough to move onto the next company, straight up lying on a resume, etc.).

Sure, as the author notes, WBI have a high false negative rate. But if you're actually a good programmer, learning basic CS concepts should be extremely easy, and these types of problems, perhaps with a bit of practice, should be relatively trivial. I personally wouldn't want to work with someone who can't extract a path from a DFS, not out of any sense of elitism but just because such an employee likely would be unable to do many other problems properly.