The writer means this. But I would suppose that “would” is more polite, because it expresses the idea of probability, and the idea of willingness, and the idea of the desire that something be done, whereas “could” is more in th e realm of ability (yes I can). He has just avoided the repetition of the idea .
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The writer means this.
But I would suppose that “would” is more polite, because it expresses the idea of probability, and the idea of willingness, and the idea of the desire that something be done, whereas “could” is more in th