It sounds like we are talking about different issues. The first topic I was following was whether it would be better to get immunity via infection or vaccinations. If given the choice, I would pick developing immunity via vaccines. This should not be a fantasy anymore with the amazing development of efficacious vaccines. When SARS-CoV2 infects cells, it can directly kill them, and it can also fuse cells to their neighbors, like a bunch of smaller bubbles merging together. There's also potential for secondary damage. Either route of exposure can lead to immunity, but one way avoids the damage.
If an individual already has some immunity, then their immune system should be able to try to neutralize viruses that it can recognize when the individual is exposed. If they don't have a robust enough response relative to the virus, then the virus can cause damage. It partly becomes a numbers and timing problem when considering the battle between the virus and the immune system.
The vaccine allows one to develop immunity without damage from infection. That is the point, in addition to not allowing the host to effectively spread the virus. If the virus is limited in it's ability to replicate or spread, the probability of variants emerging that can evade the immune system or that can be more damaging will be lower. Coronaviruses are great at not just mutating but also recombining, and the history of viruses shows that they don't always become more benign over time.
Any public health policy should be well grounded in the current knowledge, but will be necessarily impacted by realities and needs on the ground in their location. For example, Vietnam did an amazing job for quite a while limiting covid in their country. But, they have a robust medical system, quarantine facilities, and a government system that is strict. They also dealt with sars-cov1, and the population readily complies with public health edicts. England will be very different. Policies will also be impacted by what is available. Some locations don't have good access to vaccines, for example, let alone boosters. Some places have very limited medical facilities or staff.
I am not really interested in coming up with a one size fits all solution, because that's not practical or sensible. Sorry to disappoint on that.