Leetcode should only be used for easy problems - FizzBuzz types - where you are checking that the candidate can code at all, probably as the very first round of

Leetcode should only be used for easy problems - FizzBuzz types - where you are checking that the candidate can code at all, probably as the very first round of an interview. This way, I think it is totally fair, including a relatively tight time limit. The harder the problem is, the more you focus on the special skill of leetcoding, and not much else.