1) Spit droplets is much less of a problem than aerosols. You can solve that problem well with keeping distance. Aerosols are a bigger problem - they travel fur

1) Spit droplets is much less of a problem than aerosols. You can solve that problem well with keeping distance. Aerosols are a bigger problem - they travel further and linger. All the studies I've seen so far correlate CO2 with aerosol levels. If spit droplets are a concern, I have no idea. 2) Covid studies so far have shown that there's a minimum level of viral load required for an initial infection, and they have also shown that there's a correlation between initial dose and severity of infection. So, yes, how many virus copies were there originally matters very much. In general, this has been explored in a large number of studies. I'd suggest at least a cursory research before claiming issues that "render the data near meaningless".