According to Director Walensky, the only benefit from the vaccine now is presumably that it reduces the severity of symptoms.
But Vidqun when we say the vaccine "only" reduces severity of symptoms, what we're really talking about is death.The difference between having the vaccine and not having the vaccine is between feeling really ill and dying.
That's a pretty big "only".
However I'm not allowing my 15 year olds to have the vaccine. Particularly since they've already had Covid. So they're already carrying some immunity, which protects any elderly they may come in contact with. They are also super careful with hand washing, hygiene and mask wearing.