It is very clear that the vaccine is putting selective pressure on spike protein evolution. Having alternative targets makes it harder to escape.

We currently don’t know if those other sites are beneficial or not. Sometimes they can even be counter productive (ADE, but we don’t really see that yet?)

>Our findings show that most COVID-19 patients induce a wide-ranging immune defense against SARS-CoV-2 infection, encompassing antibodies and memory B cells recognizing both the RBD and other regions of the spike, broadly-specific and polyfunctional CD4+ T cells, and polyfunctional CD8+ T cells.

Meaning that natural immunity may be better, because it targets not just the spike protein like the vaccine, but also other parts of the virus.