They've worked spectacularly well at preventing death. It means health systems arent being overwhelmed even when the disease is infecting people at record levels. Chinese vaccines may not have been particularly effective so that why China has to rely on lockdowns again even for Omicron, but other countries that have mRNA vaccines are virtually back to normal now.
PRC vaccines work almost as well on severe cases. The significant advantange of mRNA was preventing breakthrough/spread which is has failed post delta, ergo countries resign to living with covid exposing all those who can't/won't vaccinate to risk - because they're systemically incapable of executing more effective lockdowns. These health systems aren't being overwhelmed _anymore_ because they spent 2 years spreading out cases load on more developed medical systems. PRC is relying on periodic lockdowns like it always has because it's fundementally more effective than vaccines at preventing deaths especially relatively to largely uninfected population. In the mean time most of the country has been back to normal since April 2020. mRNA wank is suggesting handing everyone bullet proof vests is better than just preventing mass shootings in the first place.