The only instance where I can see people not using their masks if their COVID-19 cases in their country is close to zero to none. If, however, there are still people who are not vaccinated, thus have active cases in the area, then people should still exercise caution and wear masks.
Yep, I think this part was really not well communicated that even I didn't know until I'd read a lot about it.
It improves your chances and probability of NOT getting it, or if you get it, it increases your chances not just to survive it but also show less severity for the symptoms.
But it doesn't make you immune nor does it help prevent you from spreading it. Masks is all about this!