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Maybe i misunderstood OPs question but i don't think that changes much. It's the difference between $measurement between the control group and the test group.

If that's the reduction of symptoms here, ok.

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We don't know how much it changes. We don't have much information on the difference between the ratio of $measurement0 : $measurement1 between the two groups. Once everyone is vaccinated (antivaxxers don't count, they get what they get), symptom rate is all that matters. But in the interim months, transmission rate from vaccinated sources is incredibly important, which is partly determined by infection rate among vaccinated.

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