[CharlieDigital]

   > ...it's usefulness continues to trend downwards as it becomes more standardized

I think this is a key point that a lot of commenters in this thread gloss over. That as the questions become more "standardized" and "predictable" (leetcode being a prime example), the results of using these questions tests for something, but that something is not what necessarily makes a "good engineer".

The system design questions are probably even worse because the expected responses are so templatized -- even more than leetcode.