It seems more like vaccination reduces the amount of time it takes your immune system to react once it sees the infection (presumably because it already knows h

It seems more like vaccination reduces the amount of time it takes your immune system to react once it sees the infection (presumably because it already knows how to make antibodies and doesn't need to evolve them, just start producing again). Therefore, some people's immune systems will kick in and squash it so fast that they never realize they are infected, whereas others will realize it, and a few will succumb to it. Still better than NOT having had the vaccine, but from what Israel tells us not as good as having had (and survived unscathed) the actual virus in a previous variant. Which, really, does not seem all that surprising. The vaccine has only one target from the virus for the immune system to evolve antibodies against; the actual virus has many more.