I would actually question some of these breakthrough "asymptomatic" infections of people who are vaccinated. These are people who are not showing symptoms, but have traces of the virus in their sinus. The only tests that diagnose a current covid infection involve swabing the sinus, and do not involve any kind of blood work.
If Alice has covid, and coughs on Bob, who is vaccinated, there will likely be some covid infected droplets get into Bob's respiratory system and his sinus. The virus may live inside his body for a period of time, and may even reproduce while inside his body without the 'assistance' of his body. If Bob is tested later that day, he may show as being infected, even if the test picks up Alice's droplets. I don't know that this has ever happened, or if it does happen, how frequently it happens. At no point would Bob's body act any differently than it would otherwise act.
If the above happens, is it really accurate to say that Bob is infected?
The threshold for the PCR tests can cause someone to pick up a false positive Covid test, they were never 100 percent accurate to begin with, just convenient sorting mechanism that had a reliable, but not entirely accurate way, of sorting through the positive Covid cases and separating them from the negative.
If Dr. Fauci is to be believed, he claims asymptomatic spread is not that big of deal, so if "Bob" were not to get a positive Covid case and is asymptomatic, he's still infected, but his Covid case is inconsequential.
I figured positive cases would be used to drive extreme public health measures when the reality of the situation dictates hospitalizations and death be center stage. A positive Covid case of the sniffles has no meaning and doesn't requires response from the person. When the "public health experts say they're doing it to protect you, that's when you run.