If the vaccine was so effective we wouldn’t be up to 4 boosters by now. They even admitted that it isn’t as effective especially against variants.
I’m not sure why it’s so difficult to understand that something can be effective, but not last forever. Did you eat yesterday? Then why are you hungry today?
On the other hand if the natural antibodies weren’t enough to protect individuals, you would have seen a rise in cases to the likes of the beginning of the pandemic.
Yes, naturally immune, but also many vaccinated people.