Well, a recent study done in Qatar evaluating the protection we get from previous infection vs vaccine vs vaccine and previous infection combined, is here. Maybe it can help us finally get some clarity, like looking through a dirty window with fogging glasses (thanks mask). The study shows us that those who had previous COVID infection had 50.2% chance of avoiding getting symptomatic illness, those who had 3 doses of vaccine had 59.6% of avoiding symptomatic illness, and those who 3 doses of vaccine and previous infection had 74.4% of avoiding symptomatic illness. Soooo sounds like the vaccine sort of works and having previous infections sort of work. What we really learn though is the hybrid of our immune system and the vaccine maybe is best.

see below for full Medical article

Altarawneh HN et al. Effects of previous infection and vaccination on symptomatic omicron infections N Engl J Med 2022 Jun 15; [e-pub].