The reason many people are asymptomatic is that they haven't gotten symptoms yet. There's zero proof that "the vast majority of infected people are asymptomatic". It may turn out that way, but there's no proof that's the case.
Either way, if the testing methodology remains the same, the data still has value. Maybe the only people that go get tested are individuals that are showing strong enough symptoms that they need to get tested. Whether there are a bunch of asymptomatic cases or not, we're still getting great statistical data on those that have strong enough symptoms to get tested.
You actually make some good points, and I'm not trying to get in an argument. But you have to understand that when you take the position that it cases are "meaningless" or "irrelevant", that's a very strong position. All I have to do to show you that you're wrong is demonstrate value in the stat. And there is a ton of value.
Maybe just back off the "meaningless" shtick just a bit.