It's like the usual news, health, and government agencies all decided "nobody would be interested in any of that.". (Or "COVID-19 is so new and special that nothing else applies."
Well, there's a bunch of coronaviruses out there. Most of them don't cause dangerous pandemics. Ergo, the behavior of "typical" coronaviruses probably shouldn't be used as a gauge. Distribute "typical" behavior widely, and you may get people making assumptions that don't hold, and we increase the problem.