One other thing to factor into this good picture you're making of the situation: at each step in greater transmissibility of variants and sub-variants for Omicron a given isolation or here Zero COVID policy becomes harder. That said, Xi/the CCP/PRC kept it up for almost a year after the first variants of Omicron started getting detected all over the world. Per Wikipedia the first ex-Africa case was in Hong Kong....Against classic Wuhan it's pretty much accepted the two big PRC vaccines are less effective than the best two Western mRNA ones. This might not play out the same for variants, since these PRC ones are of the inactivated whole virus type, likely expose more proteins to the adaptive immune systems than spike focused ones.
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