[aniham]

I agree on both counts. In fact, the examples of constructive feedback the article provides seem fairly worthless. If your advice is that the candidate should try doing some problems on leetcode in order to be successful in your interview process, then that's something you'd ideally mention prior to the interview, as a suggestion on how they should prepare.

I think FAANG do a really good job of preparing you for exactly what kinds of questions to expect as well as resources to study for them. That also generally reduces the need for feedback afterwards.