As gallantca explained, with the arrival of delta the idea of defeating the virus has been abandoned. The vaccinated can still catch it, transmit it, in rare cases get very sick from it and, in extremely rare cases, die from it. There is also the potential issue of waning immunity over time vs delta, as is seemingly the case in Israel (but not in the UK, surprisingly). Is it much much less likely to happen compared to an unvaccinated person? Yes. However, there is still a minimal risk that is present. I myself caught delta in Europe during my vacation, but thankfully had no symptoms.
Thus, in a way we're back to a similar position as we were when the pandemic first started, where all we can do is slow the spread to limit hospitalizations. It's all about damage limitation and preventing a collapse of our healthcare system, there is no longer really an endgame. The "endgame" is that covid becomes endemic and the entire population has developped immunity to it (either via natural infection or vaccine). That will probably take at the minimum another year, most likely more as too many people simply refuse to get vaccinated. We will therefore have to wait until they all catch covid so they can gain some form of immunity. Thankfully, we have the passport system that will allow society to function until that happens.
Indeed, this passport system not only allows for businesses to stay open despite rising covid cases, but it also protects the vaccinated from unvaccinated individuals who are potential walking bioweapons spraying delta particles with their every breath. I know that in my case, I was more comfortable working out at the gym today knowing that every single person in there was vaccinated and thus much less likely to be spreading covid.