With a vaccine that actually prevented infections they couldn't use the already vaccinated as peer (or worse) pressure to force the others to get it. Humans are weird like that, once they take the jab vast majority become full time followers and many enforcers; the alternative would mean they did something stupid or even dangerous and everyone is the hero of their own story and heroes aren't stupid now are they. Add in the fact that the media can point out the filthy unbelievers, I mean unvaccinated, as endangering the believers and it's a perfect solution. So in the end you have your fellow neighbor, workmates or even family that are now demanding you do it and this massively lessens the perceived government authoritarianism after all they forcing you is just doing what the people demand well what the people they manipulated demand... So I'm pretty convinced the partial efficiency is a feature not a flaw in the eyes of those that push it.