Not the OP but we've last had a pandemic of such proportions 100 years ago, and back then the world was not as inter-connected and inter-dependent as it is right now. Even during WW1 and WW2 industry and the economy itself were working (sometimes at full capacity), a fact that it is not happening right now. We've never had half of the planet's population in some sort of lockdown, that is the definition of a "black sawn event".

Yeah, one could say that things could have been better prepared (I'm in that camp), but one can never truly prepare for half of the working population being put on indeterminate leave on such great a scale.