Smh at the people that still don't understand vaccines and are now surprised by developments, while I knew from day 1 that all of these would have to happen, or else the whole process would be futile.
If you had a flu vaccine 20 years ago, you can't call yourself "fully vaccinated" against the flu. All vaccines lose their effect in time (at different rates depending on the disease).
The initial double-shot pfizer/moderna or single-shot astrazeneca was never meant to be a permanent "fully vaccinated". Anyone who thought that was the case, or that thought that was what doctors were saying, are morons.
You were always temporarily "fully vaccinated" until scientists, by tracking the efficacy, realized at what rate the vaccine loses it's effect against this brand new disease. Only now do they have some amount of data to be able to make very rough estimates that maybe you're "fully vaccinated" for X months after the vaccine, after which you need a booster to continue to be "fully vaccinated" for another X months.
None of this is new. None of this is unique to covid, and if you knew anything about vaccines, none of this would surprise you or revolt you.