We can protect the vulnerable without harming the rest of the population.
As I stated above, we do not have any technology that can stop viral spread.
While excellent vaccines protect the vaccinated versus hospitalization or death if infected, they provide only temporary and marginal protection versus infection and disease transmission after the second dose.
The same is likely true for booster shots, which use the same technology as the initial doses.
What about lockdowns?
The simplistic allure of lockdowns is that we can break the chain of viral transmission by staying apart.
Only the laptop class — those who can just as easily work from home as in the office — can abide by a lockdown in actual practice, and even they have trouble.
Essential workers who keep society going cannot afford the luxury, so the disease will keep spreading.
Will the same policies that failed against a more virulent strain succeed in containing a more transmissible strain?
The answer is self-evidently no.