I think a significant portion of CPC leadership was still harboring under the delusion of peaceful reunification with Taiwan -- the logic being that a hands-off approach to Hong Kong would placate Taiwan into 1C2S.
Peaceful reunification is all but a dead dream.
Well, peaceful reunification takes on many forms. There is the RoC
willingly initiate peace talk to finally end the civil war, and everyone at the end is happy with rainbow and unicorns. Obviously, for various reasons, that is never going to happen. So there is another flavour where Taiwan's economy tanks and has become utterly and absolutely dependent on mainland, and is therefore forced onto the negotiating table. Now, while this scenario is slightly more attainable, there are a lot of confounding factors, the most significant of which starts with an U and end with an S. Of course, armed reunification is the worst case scenario, and may well be the start of WWIII.
And to bring it back to Hong Kong. I am going to state an unpopular opinion here. As bad as the 1C2S and the 2019 riot was, it could have been a lot worse. Without 1C2S, China's growth would have been a lot more stunted. Even worse, it may well have bought China into armed conflict with US. While PLA of today can probably delete any US asset within 100 nautical miles of Chinese coast line, that was not the case back in the day. And if the US, given the weakness of PLA of old, collectively decide that Hong Kong needs some "democracy" and "freedom" because of lack of 1C2S, there is no telling what would have happened.
Of course, there are no what-ifs in real world, so we have to work with what we have. So, how to make this system work, at least until the alleged deadline of 2047? I suppose is where we get into constitutional theory, which is way beyond me.
The braindead takes of the ignorant make me lose faith in humanity on a daily basis. Fk it, add it onto the pile. Clearly this person has never talked to any Natives. No violence my ass.