disagree, many knew how serious it would be. Was modeled for us in China, I think what no one knew
was how the fatality rate would be 1/2 people under 50 and with no apparent underlying health issues.
you are a very sharp mind, Ive known you for around 20 years which is insane but let’s take politics out of this discussion, what fact or date was released and when did it occur to you this was serious?
Personally I don't think the Chinese have been forthcoming at all. Their model so far is to let the virus run rampant, then lockdown 55M people (after many celebrated the Lunar New Year flew back, all over the world). Do we think that they can completely stop a virus infection that had had 80,000 confirmed cases in a week? Of course not.
I don't think anyone had an accurate model for the US, its just too complicated to accurately model people's motions and infection spread, all you can do is assume infection rates given a limit on large group gatherings (and hand washing and social distancing) and then superimpose projections for the 50 states or 200 cities or whatever. Now given enough guesses, several projections will be close to the actual result. Maybe modelling with a neural net could handle the problem, but with a novel virus you don't really know the infection rates. Even so there is the "Chaos Theory" element that one small perturbation/infection could be magnified by essentially "bad luck" contagion and have a large effect.
I have been disappointed that the elder care facilities have not been better protected. This influences the death rate quite a bit. To compute death rates you have to project how various drugs will be used/developed to minimize symptoms and eliminate deaths. Lots of unknowns.