Beyond the obvious lack of trust the issue with such treaty is the procedure. Indeed it could give a say to HK courts or it could simply create a simple procedure where HK courts have no say beyond checking that the right forms were filled. I don't know how the bill was drafted.
In general, it is not unreasonable for HK to have extradition procedures with the rest of China at large (mainland, Taiwan, Macau) but again, the devil is in the details.
(Note that HK is formally part of the PRC, so saying "HK extradition to China" may ruffle some feathers).
Few, and with strict legal and political supervision [1]. The proposed law would have single-handedly smothered Hong Kong’s rule of law and stability. It was a stupid, unnecessary move pursued solely for Xi’s political concerns.
> HK is formally part of the PRC
Hong Kong is Chinese territory from a military perspective. Civically, legally and administratively, it is separate.
Hong Kongers used to identify as Chinese. But due to Xi’s hamfistedness over the past few months, that is no longer the case.
[1] https://en.m.wikipedia.org/wiki/Extradition_law_in_China
HK is part of the PRC, that's what many people miss. It is granted special status within the PRC by a national law. Hence the official name "Hong Kong Special Administrative Region of the People's Republic of China".
This is quite different from what, e.g. British people might expect. For example HK was never part of the UK and Gibraltar today is not part of the UK.
The point being that opposing "HK" and "China" as is often the case in western media is inaccurate and perhaps not productive as it sometimes seems intended solely at annoying the Chinese government.
This seems enough reason to me. Did you ever read about their antics in regards to Taiwan? They deserve everything that’s coming to them.
The strict supervision is the key here - there could not be true supervision of an extradition treaty with China when the executive is appointed BY mainland China.