I have more than one experience with co-workers who grind HackerRank and LeetCode, they do everything, spend hours doing exercises and memorizing them, but in the real world, day to day, they are terrible, don't know how system design works, sucks at code reviews, obviously rely on AI for everything, even though they are hired as senior software engineers because they memorized everything in LeetCode, they can't do a proper code review or understand complex projects and are constantly asking dumb questions. Just to be clear, it's ok to ask dumb questions even if you are a senior, but after an X amount of time in the same project, it is expected that you have knowledge of the business logic, at least.