You are missing the vital point which has been made by doctors over and over again: the response is relatively random because this particular virus has never been seen before - it's a race against time to see if these random (though intelligent) efforts and various antibodies will be effective or not. Here is a specific detailing of the 5 or so antibodies that were effective for this lady:
It is a good video and completely parallels what the articles I've linked to are saying, down to the exact proteins, etc. But, he doesn't explain why the antibodies are not always effective. That reason is because it's a first time, so the novel virus and the exact antibody(s) that worked against it have never been tagged by the immune system.
That is the point I have made over and over and over, and it is repeated in these medical articles... This is from the article above and this is the salient point:
Once your body has made antibodies that attach to the target virus then your immune system remembers this and links the two together for future knowledge.
Because it has not happened before the immune system does not have this knowledge hence why cases are so severe and mortality is so high. It is this knowledge - the exact antibody (either already available or needing to be adapted - this is currently unknown) that attaches to this target virus that the immune system needs to know. But it can only know this if: the human has had the virus before, it's in the genetic code or a vaccine has been administered to give the information. Please note: with a novel virus, the immune system does not know which antibody to use, so it has to use best guesses and adapt intelligently.
This is the only point I have ever made, and it is 100% correct - read the medical journals.
I was 100% correct. There is a gap in our immune system - it does not know which of the many many different types of antibodies to replicate in order to fight a novel virus. End of. There is no inherent immunity (also 100% correct), and there is no ready vaccine (also 100% correct). This virus is novel. It won't be as time goes by, but it is now.