"...there are breakthrough infections"

Public policy is not driven by outliers. Breakthrough infections are rare and almost always mild. (Bill Maher, for example, is fully vaccinated, infected, and asymptomatic.) I probably should have said "just about anyone who becomes seriously ill with Covid" instead of "anyone who contracts Covid," but I believe the public policy implications are the same.

I don't understand you point about boosters. If evidence emerges that the number of serious "break-through" infections is rising before a booster is widely available, mask mandates may again make sense. But I must assume from the CDC's guidance, the data does not yet indicate the need.

Those who fail to get boosters when they are available will be like people who choose not to get vaccinated now. Indeed, I read that the booster will make vaccinated people even more resistant, so availability of the vaccine will make those who get sick even more personally responsible.