“Last paragraph seems to say vax seems worthless”
Not true. Taking the vaccine proves you will do as told.
We estimated vaccine effectiveness at preventing infection (regardless of symptoms) with delta in the household setting to be 34% (bootstrap 95% CI –15 to 60).
For the data junkies, there were 125 fully-vaccinated and 40 unvaxxed folks, with 31 and 15 COVID19 infections, respectively. That means the infection rate for the vaxxed was 24.8% and for the unvaxxed was 37.5%. Thus, by being vaxxed, you had a 34% lower rate of infection.
The 95% statistical confidence interval for that 34% efficacy value was 60% and negative 15.