Why are people wasting their time on Quora by writing long answers for useless upvotes?
For me at least, writing is one of the best ways to synthesize and hone your knowledge.
It forces you to reflect on what you have learned, distill it into a group of succinct learnings, and then reflect on how best to share them.
IMHO & experiences, honing your learnings and thought processes are one of the best ways to push yourself to be a better mentor, leader, investor, etc.
Vs. just shooting from the hip.