I'm talkative like most people here. As I've mentioned in other posts, I am a college professor (tenured senior faculty --yay!! !) teaching composition and literature. I understand that many aspies who beocme professionally successful become computer programmers or college faculty. In college, one can talk about what one likes. I choose the syllabus and lead the discussion on things that I love, like Othello or Madame Bovary or post-colonial politics.
I do have to remind myself that it is essential to let the students speak as well and to express their own views. This does not come naturally to me, but I force myself to do it. I'm told, by colleagues who do not know that it is a struggle, that I do it very well, better than most. Perhaps that is because I am so conscious of it.
My two sons both have autism with severe learning delays. One, the younger at eleven years old, is quite low functioning, and does not speak at all, except for the odd word from time to time ("pizza," "pool," etc.). My older son )who is sixteen) focuses on
Disney videos and also likes everything he has ever liked, so he is equally likely to be thinking about Big Bird, Goofy, Batman, Star Wars, or Harry Potter. He never shuts up, about his own topics. If it were not for the learning delays, he would probably be diagnosed as an aspie.
So, I agree, talkativeness is often a trait of AS, but it is the drive to talk on a favorite subject, often with little observation of the response of those around us. I continually attempt to guage that resposne, often too late, but the trait is a positive for my profession.