I have seen several comments like this on this thread suggesting people are contagious during the incubation phase. Do you have a source for this? AFAIK this has not yet been confirmed, other than perhaps a few anecdotal cases.
I check out John Campbell on YouTube every couple days. He has this unique style of presenting current developments and research papers in a no-bs manner and commenting on them, currently urging for more proactive measures mostly.
[1] https://www.nejm.org/doi/full/10.1056/NEJMc2001468?url_ver=Z...
It seems likely that if we fully controlled most of the cases that had visible symptoms, the spread would stop, even if we failed to control the cases which did not show symptoms.
The same is true for spread via surfaces: while I'm sure it's possible and happens, it seems like the primary mechanism of infection is breathing infected respiratory droplets from someone else.
Sources: https://www.cdc.gov/coronavirus/2019-ncov/about/transmission...
If true, social distancing, hand hygiene, and not touching ones face would bring asymptomatic transmission down to almost zero.