The weird insistence on anti-body levels is another weird thing, just plainly ignoring immune memory.
I suspect that we are not seeing grave illness anymore in most of the population due to the immune naive population being very low and the few people dying now are in the traditional old age and immune compromised categories that also die by other respiratory viruses under similar circumstances.
Reading the science so much is fumbling in the blind (over 2 years into this). They are still pushing for under 5s to be vaccinated in some countries even though at the efficacy of the vaccine is less than 40% something that would be considered a failure in any other vaccine development and knowing the groups it he lowest risk group there is.
And before you call me anti-vaxer I had two doses of Pfizer and have had covid 3 times.