that's the whole damn point, when you find a cancer in medicine you isolate the tumor, experiment with different therapy approaches, then when an optimal path is found, apply decisive action. there is a sickness in Shanghai and I'm not talking COVID.
The SICKNESS IS CALLED WESTERN INFLUENCE. The more western oriented you are the more it's people, especially the young to want to copy the degenerate generation in the west do.
Let Shanghai open up as you suggested and treat it like a version of Special Economic Zones as they have done with cities like Shenzhen, only this time is to see how the relaxing of rules, along compulsory VACCINATIONS and the inevitable covid-19 infection rates and death will lead. If the results are acceptable from the number of cases to the number of fatalities, not to mention the health care system in that city does not crumble or get too overwhelmed then by all means, other cities in China can follow according to the local governments abilities, and health care infrastructure.
But if the resulting opening up resulting into chaos then at least the results should be broadcast far and wide into every corner of China to show to the citizens that such drastic opening up, even on a tier 1 city like Shanghai isn't really ideal and must not be applied all over China. People need to see consequences of their actions, because it's far too easier to assume the most rosy scenarios in one's head owing to the fact that China is the only country with the largest population not to suffer huge infections and deaths from Covid-19. So all these talk of doom and gloom that awaits them are too far removed from their lived experience.
What is pertinently obvious and true to most people living under strict policy is loss of jobs, family and relationship pressures, fissures due to economic impact, social impact, and their mental health.
To most of these protesters they would rather take their chance in getting sick and dying from Covid-19 rather than to live and die from poverty and shame.