It sounds like we're in agreement. Focusing on requirements for confirmed positive covid patients is of negligible benefit. Once the "people without antibodies" actual risk factor is curbed, then we hopefully have had the scientific research to determine what the next best lowest hanging fruit to address is.
> I’m not sure it matters if the antibodies are from the vaccine or infection.
I'm not entirely sure either. There is some research that since the vaccine is just the spike protein, while natural immune response was to the entire virus, that the natural immune response is more comprehensive.