Is it your belief that this vaccine is less effective than most vaccines? Because that's just not true. This is a phenomenal vaccine in terms of efficacy and protection. No it is not 100%, but the best hope at the time Covid hit was somewhere around 60-70%, and it's far better than that.
Moreover, even when the vaccine "fails," it still prevents people who contract the disease from getting really, really sick at an even more phenomenal rate.
Bottom line is that it is roughly 90% effective against lab-confirmed, symptomatic infection and approaching 100% against moderate and severe disease for general Covid, and 60%-88% against symptomatic infection and 96% effective against severe disease from the Delta variant. That's amazing.
To put that in perspective, the original Salk polio vaccine is/was 60-70% effective against polio, and the much improved later version still never got above 90%. Smallpox vaccine is 90-95% at preventing severe disease. Chickenpox is around 82%.
And as far as antibody counts go, I think we'll find that they're not as much of a guidepost as we expected them to be.