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I don't believe it's actually the case that once you are infected by the delta strain your body has lasting immunity to that same strain.

It looks like that also is affected by age and other constraints: https://www.nature.com/articles/d41586-020-00502-w

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To not have lasting immunity to the same strain is anti-science. We already know that people who were previously infected by covid are immune to many different variants. To think otherwise would be illogical. Even SARS patients from 2003 have immunity to SARS 18 years later.

The vaccine is a single antigen. A live virus has many antigens. It makes sense your body would have more attacks if naturally infected.

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