This link helps explain why, even long after you get covid-vaccinated, just exactly as this link explicitly says, you should still continue to "wear masks, practice physical distancing, and wash their hands when around those who haven’t been vaccinated—just in case. ", at least until this epidemic is well under control.
It also explains the difference between IgG antibodies and IgA antibodies, which I didn't know about before and find quite interesting.
"... From what we know so far, Covid-19 vaccines cause the body to produce a class of antibodies called immunoglobulin G, or IgG antibodies, explains Matthew Woodruff, an immunologist at Emory University. IgG antibodies are thugs: They react swiftly to all kinds of foreign entities. They make up the majority of our antibodies, and are confined to the parts of our body that don’t have contact with the outside world, like our muscles and blood.
But to prevent Covid-19 transmission, another type of antibodies could be the more important player. The immune system that patrols your outward-facing mucosal surfaces—spaces like the nose, the throat, the lungs, and digestive tract—relies on immunoglobulin A, or IgA antibodies. And we don’t yet know how well existing vaccines incite IgA antibodies.
That above " we don’t yet know" part is most unfortunate and I would say we urgently need to research it so we do know and, if the answer is 'no' i.e. if existing vaccines do NOT incite IgA antibodies, that may well mean we will have to vaccine literally everybody who hasn't yet had the virus to ensure it doesn't keep killing large numbers of people.