You're right that 'asymptomatic' doesn't necessarily make sense when counting prevalence of a disease, but it does make sense when trying to contain that disease, as asymptomatic people can still be contagious. The metrics that have been published come from the context of trying to slow the spread, not from the context of counting the people most badly affected.
That’s fine, I agree. I disagree with containment as a strategy but IF you want to practice containment asymptomatic infection is relevant. Altho just so you know there is essentially no evidence that COVID-19 spreads asymptomatically. However I can point you to a bunch of studies strongly demonstrating pre-symptomatic spread (important distinction).
My point is COVID-19 stands for coronavirus infectious disease 2019. If you have no symptoms you have no disease. You don’t have COVID-19 without symptoms, you have a SARS-2 infection. The distinction is incredibly important.
