Because talking is a function of conversation between two or more people. It isn't the act of speech as a one way carrier. I've been able to dictate to my compu

Because talking is a function of conversation between two or more people. It isn't the act of speech as a one way carrier. I've been able to dictate to my computer for years but nevertheless still prefer to type. Dictation is actually a skill one has to learn, as in the case of people such as lawyers and actuaries who don't type their own letters, it doesn't come very naturally to most people.