The current evidence points to asymptomatic transmission being much less likely than symptomatic transmission. This =/= no evidence that supports asymptotic spread.

And that’s ignoring that there are separate studies that think the chance of asymptomatic transmission is much higher, and studies that estimate the majority of transmission is caused by asymptomatic cases. Given the cost of wearing a mask is low and the price of being wrong about the evidence is high, there remains no good reason not to wear a mask.