you are right i did miss an 's' in millions. humans indeed do not need to learn from millions of examples however all the pieces of text(spoken or written) someone might come in contact with in their life give them invaluable experience which improves their writing capabilities. I gave my training as an example of how someone might benefit from interacting with language however a human does not have (nor realistically can) review millions of examples, instead he should try to maximize his interactions with his language of choice to a realistic degree.
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