“Question: considering that around 35% of people with COVID-19 show no symptoms”
Serious question: How infectious is a person without symptoms?
Unless the virus has wings, it requires some vigorous expulsion to travel more than a couple of feet. So if an asymptomatic person isn’t screaming at someone, singing loud or deliberated exhaling as hard as possible, how great a risk do they pose?
That's a great question, and I think it's one still being answered at this point. Assuming that they are contagious (and there does seem to be some conflicting evidence here, which may mean it behaves differently in different people), it would work like any other person to person transmission. Your asymptomatic carrier would release respiratory droplets when talking (far more when talking loudly), coughing or sneezing (which could be due to allergies or just random coughs or sneeze we all experience from time to time), singing, or otherwise exhaling through their mouth. Another person breathes in those droplets or gets them on their hands or face, and the virus is able to find a new host.
Given the death toll already taken on the US and the relative risk of being an asymptomatic carrier, isn't it better to be safe than sorry? Particularly when in crowds indoors (e.g. grocery shopping) or visiting older or otherwise vulnerable (e.g. immunocompromised, cancer patients, HIV/AIDS, etc.) people? I know I don't want to be responsible for anyone getting an illness that ultimately kills them or permanently damages them if there's any reasonable way for me to avoid it.