We live in the strangest times, we have the honor system, and if you are fully vacinated in America, you don’t have to wear a mask. However states can insisted you do, counties also can, and so can businesses.
Even though I have had both of my vaccines, I automatically put one on if I am going inside a business. This is my choice.
My thoughts are that there are always the people that don’t intend to get vaccinated, and will not wear a mask, as it is not mandatory now.