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I don't think it is required for every single structure, only on ones where explicitly asked or where multiple resonance structures are possible. In such cases, writing out the formal charges as a way of showing work as to how you reached the correct structure is probably advisable.
Formal charges are a useful quick check to see if your Lewis Structure is stable or still needs reworking. I would recommend quickly checking formal charges on most lewis structures you draw for this reason, unless it's ridiculously easy or it's a structure you know already.
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