Many times you don't know what's useful to your colleagues until you hit publish. Writing is useful as experimentation that way.
It's also easier to sit down and come up with a well thought through answer that you can link out when asked again. Opposed to paraphrasing each time and potentially missing key points/clarity.
For example, I wrote this up after meeting lots of clients when I was freelance who were regularly questioning why they couldn't find technical co-founders > https://hackernoon.com/developer-risk-profiles-why-you-wont-...