It is very tricky keeping pharma happy and coming up with justifications that don't sound totally whacky. Let's be understanding of the challenges...
Op-Ed: The Jury Is Out on COVID Boosters
— Scientific evidence, not vaccine makers, must drive vaccine decisions
"And although it is absolutely right to prepare for the possibility that we may need boosters, in reality, we don't yet know if we'll need them and, if so, when."
^^^ pharma needs money, sooooo.......yeah
"However, we don't know what levels of antibodies correlate with protection against COVID-19. In part, this is because it's not just antibodies that offer protection after vaccination: T cells may also offer robust, long-lasting immunity".
^^T-cells don't work after natural disease???