Obviously every writer is different, but there seems to be two main categories, as far as I can see: A. The sort of writer who is constantly coming up with ideas (good and bad) and consequently finds it difficult to focus on one particular thing and see it through to its completion, and, B. The sort of writer who has to work hard to grind an idea out but when they do it's usually a pretty solid/workable one.
I was wondering what people think accounts for this difference. Does it come down to the sort of person you are and the way your brain works (and therefore there's not much you can do about it!), or does it simply come down to one's approach to writing (and can therefore be changed quite easily)?
For instance, has anyone started off as a stereotypical example of either and made a conscious effort to move towards the other and now find themselves a much more balanced writer as a result?