There was a period of time there when the vaccines really did stop transmission and that was part of the vax campaign. And then Omicron came and all that went out the window (along with non-k95 mask effectiveness). It still lessens the effects of COVID and is worth doing for anyone outside of a tiny sliver of the population IMO but its unfortunate that the PR campaign started out that way - they broke the cardinal rule of 'underpromise and overdeliver.' Downplaying natural immunity didn't help either.