Depends on the country, for example are the conditions identical? I'd argue most aren't thanks to the Delta variant and many countries with high vaccination rat

Depends on the country, for example are the conditions identical? I'd argue most aren't thanks to the Delta variant and many countries with high vaccination rates are also not locking down as hard which means there is a lot more transmission. Basically there are many confounding factors to take account of in order to understand the impact of vaccination on infection rate. For example here in Iceland (84% >12yo are fully vaccinated) we've increased restrictions but not nearly as much as we did for prior outbreaks and have substantially more tourists coming through the country. But at the same times as we've had many more infections we've had considerably fewer hospitalisations. Right now we're having kids go back to school and that's causing a spike in unvaccinated infections. The problem with looking just at headline numbers is you miss all the context.