Alternative view: When you go on such a massive hiring spree in the last 1-2 years from headcount X to headcount Y, how can you be shocked at you're not getting

Alternative view: When you go on such a massive hiring spree in the last 1-2 years from headcount X to headcount Y, how can you be shocked at you're not getting headcount Y amount of productivity? Proper onboarding attention and tenure impacts productivity.