I think the expectation was ON AVERAGE, infections from the jabbed will be less severe than those who don’t get them. That’s all.
There was never the expectation that just because you’re vaccinated, you are going to be immune from infection. That’s the reason for the CDC’s most recent subtle alteration of their definition of vaccines.
There’s also the expectation that OVERALL, the jabbed will be less likely to be infected than the unjabbed. I’m not sure if this is true anymore.