Seems to make sense, but it’s generally true. Ebola isn’t quite as transmissible as it seems it should be, but it is very serious.
Likewise Bird Flu. H5N1 types very dangerous, but not actually that contagious.
All true. But the viruses you mentioned, and I’d include HIV in that too, seem to require a large concentration of fluid to transmit. Not tiny airborne droplets from the respiratory tract.
But I am no virologist I am just a stand-in for the movie production that plays out on the internet.