Some countries have, some haven't been able to yet. I'm not going to start ideological arguments just want to bring you a new perspective.
The main criteria is your healthcare capacity.
In the Netherlands facemasks are only mandatory in public transit at this point. But you need a vaccine or test certificate to go to a restaurant/bar. The number of infections went up with everybody going back to the offices, but the hospitalizations and deaths are still on the low numbers.
In Germany you have regions like Saxony with extremely low numbers of vaccinated people, infection numbers also went up, but the hospitalizations are equally high, and the healthcare system is now strained with beds being repurposed for covid wards and surgeries cancelled.
My point is that _if_ we have unlimited healthcare resources and capacity then yes, theoretically, everything could go back to normal. But irrespective of where you sit ideologically our resources are finite, so our decisions have consequences.