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Ususally when writing you start form scratch each time. Not with non-linear writing. There is no need to reinvent the wheel for each piece.
This also means you are not reinventing the wheel elaborating concepts you've done before.
A huge advantage is that it insights acumulate with non-linear writing . You can also combine atomic notes to form larger pieces with far greater efficiency than linear writing. It is far more efficient as it prevents reinventing the wheel.