There are two main types of immunity you can achieve with vaccines. One is so-called "effective" immunity, which can prevent a pathogen from causing serious disease, but can't stop it from entering the body or making more copies of itself. The other is "sterilising immunity", which can thwart infections entirely, and even prevent asymptomatic cases. The latter is the aspiration of all vaccine research, but surprisingly rarely achieved.
It seems with the Pfizer and Moderna vaccines, the result is effective immunity. This is actually a good thing because once most people are vaccinated and start to freely interact, the virus will rapidly spread throughout society. Since most people, especially the vulnerable and elderly, will be protected, herd immunity can be achieved safely.
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