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NancyLebovitz comments on Open Thread: April 2010, Part 2 - Less Wrong
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A straightforward counter-argument is that forgetting, i.e. erasing information, is a valuable habit to acquire; some "information" is of little value and we would burden our minds uselessly, perhaps to the point of paralysis, by hanging on to every trivial detail.
If that holds for an individual mind, it could perhaps hold for a society's collective records; perhaps not all of YouTube as it exists now needs to be preserved for an indefinite future, and a portion of it may be safely forgotten.
Forgetting is crucial for my ability to do dual n-back.
That's a fact about the human mind, though; DNB is designed to stress fuzzy human WM's weaknesses. DNB is trivially doable by a computer (look at all the implementations).
Computers have memory limits. They're just much higher than human limits.
WM?
It's not just quantity; it's quality. Human WM is qualitatively different from RAM.
Yes, you could invent a 'dual 4-gigabyte back', and the computer would do just as well. Bits don't change in RAM. If it needs to compare 4 billion rounds back, it will compare as easily as if it were 1 round back. Computer 'attention' doesn't drift, while a human can still make mistakes on D1B. And so on.
You could cripple a computer to make mistakes like a human, but the word 'cripple' is exactly what's going on and demonstrates that the errors and problems of human WM have nothing interesting to say about the theoretical value (if any) of forgetting.
You only need to forget in DNB because you have so little WM. If you could remember 1000 items in your WM, what value would forgetting have on D10B? It would have none; forgetting is a hack, a workaround your limits, an optimization akin to Y2K.
Working memory.