I'm imagining it's going to bite these people on the backend later in life when they sacrificed everything for their careers and potentially missed other major life milestones: cultivating a relationship, starting a family, etc. I know not everyone spends 6 months getting into Google, but there are so many other companies that will take you without 6 months of preparation. If career is the only thing that gives you meaning in life, sure, but I'd rather not put all my eggs in one basket.