Because while you can be an asymptomatic carrier it doesn’t you are very infectious at that point, viral shedding levels and coughing play a bit role in this.

Because while you can be an asymptomatic carrier it doesn’t you are very infectious at that point, viral shedding levels and coughing play a bit role in this. Also if the R0 value is much higher than the current estimate it’s good because it would also means it has a much lower mortality rate and overall much less lower severe infection rate than what we currently can estimate. R0 values are very hard to calculate for novel viruses you usually only can figure it out after multiple outbreaks where you can account and control for environmental and societal conditions.