2 interviews with some experts in China (not Zhong Nan Shan but someone else) were quoted by the Taiwanese newspaper. Some of the points they make on this front:
The 1st guy who worked on SARS in 2003 has a lot of points:
1 - should not worry too much about those who are - then +. They are not that infectious - those infected showing no symptom also are not as infectious [it makes sense since they are less likely to cough on things]
2 - key is to wear masks, wash hands and social distance
3 - COVID-19 is more sneaky than SARS
4 - he is not counting on any magical medicine since we have not found one for SARS, MERS, EBOLA, bird flu [is this true?]
5 - treatment is basically keeping the person alive and hoping the immune system will kick in
6 - basically it is ARDS so treat as ARDS
7 - he thinks most recovered can fully recover after some time as SARS (after a hear) [lots of reports say damages are permanent]
The 2nd guy's point is no need to worry about those who are infected but without symptom if there is no confirmed cases. That is, if the person infects other people, some of them must have symptom and will be confirmed.
https://udn.com/news/story/120936/4484964
https://udn.com/news/story/120936/4484921
Anyway, I guess Mainland China must be somewhat confident that things will be OK for them to start loosening the restrictions.
It seems their mobile phone color-code system is a black-box - you apply and you get your color code to use at checkpoints but no one knows the criteria? I don't know how we can implement anything like that in the US, not to mention globally.