A viral load in your nose doesn’t infect anyone. That is kind of the point of symptoms. A single sneeze does far more to spread the virus than many relaxed breaths.
Yes, and in my region, at least, non-Covid-caused sneezes are common (and were common B4 Covid showed up.) Allergies, coincident colds, intolerance to humidity changes, etc., can all cause sneezes, regardless of whether one has a high load of Covid in their nasal passages. IMO, this could be the primary “method” of spread of Delta.
Since January 2020, I have witnessed one, ONE person in public who, observing her, I thought: “That person needs to go home or to the doctor”. “Random” sneezes? They are legion.
Then there is singing and shouting. “Geez, those people on the other side of the pond / room / etc. are noisy...”
With kids (and some people) we have nose-picking and such. Touch is a secondary vector, but, as infectious as Delta is, it is not to be discounted.
Now, I will grant you the definition of asymptomatic may be a little hazy: If a whiff of an allergen causes me to eject a nice batch of virions, but the high load of Covid virions in my nasal passage did not and does not at present cause my sneeze, am I “asymptomatic”?