That wasn't the point we were discussing at all. It was that having people double vaccinated and boosted is stupid, which you seemed to be inferring as it loses its potency after 6 months or so.
As I said, our goal should be to get everyone double vaccinated and boosted. It is better for their health and for the load on our hospital system. Even if only 6 months it can have a great impact and is still effective after that time to a lesser extent. It is, and always has been, about flattening the curve.
The extra doses were most effective against infection and death among Americans aged 50 and older.