Online question-answering services are unreliable
In my experience, online question-answering services like Stack Exchange and LessWrong's questions feature work around half of the time (when the question text is high quality and the question is submitted to the most promising venue).
Some services like Quora are even less reliable; I would say Quora probably gives good answers to less than 1% of questions I've asked.
- Unreliability of online question-answering services makes it emotionally taxing to write up questions
- Ongoing friendship and collaboration is important -- one way to get around the unreliability of online services is to have more collaborators you can bounce ideas off of