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That info you used is rather old, pre-dating Delta.
Vaccination is now, roughly, 50% effective at preventing infection from COVID. That is why CDC wants people to mask up again.
The purpose of vaccination now, is that it still GREATLY reduces severity of illness.
Numbers are all over the place and we're just starting to get meaningful data out of Israel. We are finding that efficacy definitely wanes after 8-9 months hence the recent hubbub about boosters. Israel was a month or so ahead of us and on the leading edge of that timeline. My wife was one of the first in the country to get vaccinated in Dec 2020 and is now in that booster guidance range. I'll be up in September. The 50% you quoted hasn't been formally vetted and showed up in some random articles. Efficacy against delta looks to be a dart toss if you want to cherry pick numbers.
But as you said, regardless of infection, it's pretty uncontested that if you are vaccinated you have an incredibly minimal chance of getting very sick. Which is really the key right now with hospitalization use spiked through the charts.
Most states are reporting their vaccination rates in comparison to infections and that number is remaining pretty consistent in the 98%+ range are unvaccinated. And that is with Delta data up to date.

