People can spend their entire lives studying one tiny aspect of our immune system; there are so many interacting, irreducibly complex systems that the average layman can be overwhelmed.

But there are simple things that can be explained visually. See, for instance, this video of Japanese scientists illuminating airborne droplets with green lasers: https://www.youtube.com/watch?v=hyZm6dx9Hss

Now, the contention here isn't that there are important concepts that should be explained to layman; the contention here is that there are important concepts that actual scientists need to explain to the decision-makers at the CDC.