So what? Sooner or later everyone will have COVID. I hope to get it soon, as I am fully vaccinated with a highly effective vaccine and I am in good health and there are adequate ICU beds should I need one (before they fill up with the un-vaccinated scum).
Locked borders give a country time to vaccinate, increase ICU bed numbers and stock up on antivirals. Once these measures are in place the borders can be opened. HKG is squandering its time of low case numbers and closed borders as it blindly follows what the CCP wants.
The good news is that COVID will do its own thing. One day it will leak and spread in HKG and the mainland and both areas will be forced to accept it as endemic and adjust to the new reality. The sooner this happens the better.