As protection for vaccinated people is not 100% and the probability of unvaccinated people being contracting Covid and being more contagious than vaccinated people is high, all pilots and cabin crew who are not prevented from getting a shot due to health reasons should be vaccinated. Testing is an improvement but always works in hindsight. Flight decks may be quite safe due to ventilation and we had no infections of (still unvaccinated) pilots flying together even with one being found positive later, but briefing rooms, lounges, crew buses, etc. less so.
It is questionable whether one can be too sick to be vaccinated or wear a mask but still be healthy enough for a medical. It's also questionable whether someone denying a vaccination because of non-scientific reasons should be entrusted with a machine that flies based on scientific principles.