With Computers: Don't Repeat Yourself. With People: Do Repeat Yourself
breckyunits.com
breckyunits.com
If you look at good, effective oratory style, and write it down, it looks totally horrible. One of the major differences is more repetition. When all the words are present, written down on a page, it's easy to go back and re-read. People can also go along at their own pace, make sure they understand before moving on, and are generally more in control of their experience.
In spoken language, the opposite is true. You have one chance to express yourself, and you have to make sure it's successful, despite the listening abilities of the audience. So while written language favors variation of vocabulary, because the same word repeated a dozen times stands out as bad style, spoken language uses it as a basic tool of getting a point across.
When I deliver presentations, I insert tons of back-references, repeating previous points or conclusions. When using powerpoint, I also insert a lot of forward-references, giving a brief outline of the topics to be immediately covered. I generally try to mimic how, if I were reading an equivalent paper, I would be flipping back through the pages or how I would have to read something a second time to understand it.
At the lower level, even sentences are allowed to repeat themselves a lot more in speech than in writing. Where a written story may use a pronoun, speech is more likely to repeat the full noun for emphasis. You can also use the trick of repeating a phrase with different vocal characteristics to emphasize it, which simply doesn't translate into writing without being awkward.
I find that many people don't have the context. I suspect part of it is that I don't see the world the same way most people see it. Shorter remarks rely on shared context to be properly understood. Example: In my teens, I remarked to my father that I was considering "running" (something). I was a role playing gamer considering taking up gamemastering. He assumed I meant jogging for exercise. I didn't bother to try to correct. It seemed futile.
e.g.
I have an allergy attack.
Allergy medication will relieve an allergy attack.
I desire allergy medication.
I will go to the drug store and ask for allergy medication.
However, the sense of repeat used in the submitted article rather concerns redundancy, whereby the concept itself or a particular relationship is repeated in a redundant manner, without adding new information. This is merely to prevent miscommunication.