"The animals are treated like a commodity -- a production machine..."
https://www.youtube.com/watch?v=lCObshZq3zU
The whole idea of "hobby breeders" leaves a loophole for people in HK to breed in awful conditions, and there is no accountability that they are providing their dogs a quality of life worth living. They are producing excessive dogs (and kittens) that cannot be cared for.
It's good you know about the rescue organizations in HK, and I do hope you can find what you're looking for through them. With some patience, you very well can find the specific breed you want and help save a life.
On a personal note, after living in Hong Kong for a few years now, I've really struggled to understand the interest in puppies of specific breeds. If you take a look around you, you'll see there is a rather huge, ethical problem of not enough homes for dogs here, be they friendly stray dogs that would benefit from a permanent home and care or dumped dogs from puppy mills. Thousands of dogs get put down each year because there aren't enough adopters, meanwhile unethical puppy breeders are chugging out more puppies. It's an awful situation. If Hong Kong has provided you with a good home and quality of life, then I strongly suggest you look at how you can help this situation to give back, particularly if you have a whole in your family that needs filling. We don't choose how our children look and what personalities they have, and a puppy is no different. They will be a member of your family, not a coat that matches your outfit. For sure, if you take your time and check regularly with the shelters, you will find one that will love you back ten times more than you love them!!! Their love and appreciation for the care and love you give them far outweighs how long their legs are or what color coat they have. And also, by adopting from them, you're helping to support them to continue to rescue animals and work on Trap-neuter-return programs to help address the problem.
(I'm sorry, but I can't find a specific SCMP article I had in mind in which they explain how around 2,000 dogs are put down in HK every year...)