An effective vaccine reduces numbers across the board. As mentioned in the article you cited, "Vaccine effectiveness is a measure of how well vaccination protects people against health outcomes such as infection, symptomatic illness, hospitalization, and death."

That is, fewer people get sick, and fewer sick people develop symptoms, and fewer symptomatic people are hospitalized, and fewer hospitalized people die.

It seems that @HMH would like all those numbers reduced to zero, which is obviously impossible