>The current mRNA based SARS-CoV-2 vaccines are effective at preventing severe outcomes like hospitalization and death

According to this very article this isn't even really true any more. Of the currently hospitalized population in Israel 60% are fully vaccinated. With 78% of the population vaccinated that implies the protection is actually surprisingly weak.

" “There are so many breakthrough infections that they dominate and most of the hospitalized patients are actually vaccinated,” says Uri Shalit, a bioinformatician at the Israel Institute of Technology (Technion) who has consulted on COVID-19 for the government. “One of the big stories from Israel [is]: ‘Vaccines work, but not well enough.’”