If I understand what you are saying, I am thinking it is because it has already mutated at least twice and maybe more. I also will add, I think there is a load of information being withheld from the civilians all around the world. I can’t help but wonder about genetic predisposition with this. Because it makes no logical sense I can find about who it affects the worse. There has been very healthy and physically fit people die from it, but some very elderly it barely affects if they even contract it. The only thing I can think of that makes any sense is some sort of genetic cause and effect. Also seen that China has released info about some of the autopsy’s they have done that show up to 20% cardiac damage in patients that had no history of cardiac problems.
Now I am a bit of a conspiracy theorist for the simple fact that I do not trust any government agency or federally level politician and high level state politicians. So with that said, it seems quite possible that information is being kept from us for some reason. If they can develop test that can determine if you are infected in minutes instead of days over the course of a few months, they have to know much more about the workings of this virus and are not sharing it.