A few comments
I'm not surprised to find that most consider themselves better at writing than speaking. Have you ever considered that speaking is a more important skill overall, for the quality of life?
Moreover, it seems that there's always a better way to carry out any conversation, if it hasn't gone flawlessly already. What to say or not to say, and how to act would all hinge on good judgment that becomes ingrained with experience.
I agree that some people's brains are hardwired better for communication. It's genes/talent, call it whatever, every other person is just configured slightly differently from birth. And while that could separate people in potential, most never reach their maximum potential... so your overall skill level should be much more affected by your involvement and the work you put into it, than the hard wiring of the brain.
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