IOW, it turns out that it is really hard to test for the high-level skills that actually produce results, no one has really cracked how to do it, and "Leetcode"

IOW, it turns out that it is really hard to test for the high-level skills that actually produce results, no one has really cracked how to do it, and "Leetcode", despite their marketing, has also failed to figure out how to really build a useful test set.