If a prompt says, 'make this better for customer', the model has to guess what better means. A correction-first edit can make it 'Make this better for a customer' without inventing a new strategy. A stronger manual edit might add the intended output, such as 'Make this clearer and more polite for a customer.'
If a prompt says, 'dont change the meaning summarize in 5 bullets', punctuation matters. 'Do not change the meaning. Summarize it in five bullets.' is easier to follow and preserves the constraint.
These are small edits, but they reduce the chance of getting an answer that is too broad, too formal, or not formatted the way you wanted.