Yes individuals who have been vaccinated or recovered from natural infection will have durable immunity and significantly lower risk of severe outcomes like hospitalization and death. [5][6]
The real question: is mass vaccination effective at preventing the spread and increasing trasmission/virulence of variants of concern? A growing body of the scientific literature and evidence suggests not. [1][2][3][4]
This doesn't mean we shouldn't be using vaccines, rather we should use them in a highly targeted way, and supplemented by other therapeutic modalities.
[1] Risk of rapid evolutionary escape from biomedical interventions targeting SARS-CoV-2 spike protein https://pubmed.ncbi.nlm.nih.gov/33909660/
[2] Can we predict the limits of SARS-CoV-2 variants and their phenotypic consequences? https://www.gov.uk/government/publications/long-term-evoluti...
[3] Imperfect Vaccination Can Enhance the Transmission of Highly Virulent Pathogens https://journals.plos.org/plosbiology/article?id=10.1371%2Fj...
[4] Why does drug resistance readily evolve but vaccine resistance does not? https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.2016...
[5] Longitudinal analysis shows durable and broad immune memory after SARS-CoV-2 infection with persisting antibody responses and memory B and T cells https://www.cell.com/cell-reports-medicine/fulltext/S2666-37...
[6] Rapid induction of antigen-specific CD4+ T cells is associated with coordinated humoral and cellular immune responses to SARS-CoV-2 mRNA vaccination https://www.cell.com/immunity/fulltext/S1074-7613(21)00308-3