If you take a question in a written form, you can look at it, analyze it, and debate it.
Verbally, as far as I notice, people answer a bit strange – if the question is detailed, people tend to answer to just a part of it.
If I have a question, and the answer is complex, a lot of time, in a verbal manner, people reply to just a part of it.
The solution, as far as I see it, is to try and give a complete answer, even if the communication is oral.
