I think the discussion is a little obtuse and we are missing some things. COVID is being considered as a flu-like disease here with low level mortality and for most its an inconvenience. Why have we fcuked our economy for something that is outstripped by flu each year. etc etc.
What's missing is the considered potential for a mutant with a significant death rate and the type of virus we are dealing with. Corona virus is a fairly stable virus which means mutations are slow to happen but when they do they tend to stick around. Other viruses are more volatile and mutate incredibly quickly but none really stick around. Mutation by it's nature is random. It could mutate and make itself non-infectious or not applicable to humans any more. It could turn into a monster; grrr. In order to mutate viruses need host time, it doesn't happen in the air between folks. Currently COVID is getting lots of host time so the probability of mutation is high and because of the virus type mutations are likely to be stable. Imagine the possibility of COVID with HIV type mortality, airbourne and very infectious, long infectious time so it spreads well and kills. To reduced the probability of mutation we need to reduce the numbers of infections.
Obviously immune response comes into this. If we consider mutation as iterative evolution then it favours a mutant that is not treated by the immune system response to the previous strain (applies to vaccine too Obvs). The measures are dealing with what it could be, not what it currently is. Ignore it and it will go round and round with various mutations until we get a nasty one. The concept of keeping infection high to build up immunity in the population at a fixed rate is valid when considering most non-viral diseases but it's an ignorant assumption to apply it to all disease.
I'd recommend having a read at some scientific articles rather than how the press present it. That is almost back to cold fusion for those who remember that shitstorm. Scihub gives access to those wishing to commit copyright crimes or you can pay for journal articles. Science not pseudoscience.
Mutant X is the one to wipe us out and discussion of X-factor always amuses me. Thought I'd share just in case it's not just me who finds it funny.