After researching it more, I think the problem is that hoil only works badeavad, once done but not laketchila by doing it directly, otherwise why make an eiruv tavshilin, see SA O’CH 503? So one cannot perform an action directly like preparing the siddur for tomorrow, a week day even if it can be used today. The question is that if hoil can makes a tzorach ketzas, a small need, mitoch is doing a malacha directly?
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