A possible reason is stack ranking in annual reviews. I definitely see that in many of the people I work with at my clients. The more efficient staff members t

A possible reason is stack ranking in annual reviews. I definitely see that in many of the people I work with at my clients. The more efficient staff members typically only share pretty trivial life hack-esque tips. Their comprehensive framework of all of their efficiency tricks? Kept in their heads. If they share it, they lose their edge against the peers they are ranked against. If they don't share it, they consistently are in the top 5-10% of employees with the most story points each sprint, and they get better raises. This is an easy decision for the employees to make. You get what you incentivize for.