Hey there,
Can I ask which country you're coming from? I'm not a dietician but I'm a registered pharmacist from the UK and I'm also currently practicing at a large community chain in HK. I can tell you a little bit about what I see while working with dieticians at my place of work but to me, it really doesn't seem that great. This is only my opinion but the whole general "medical" world is not so great in HK, except as a medical doctor, I feel all other allied professionals are not as respected than in other Western countries and HK people are still learning about these professions.
I've worked as a pharmacist in the UK for 5 years prior to coming to HK and now my daily job is simply a "seller of medicines", customers do not accept my medical input and they purely only trust "doctors". Dieticians in the community are relatively new and with the large chain that I work in there are only around 10 so far but they are still actively recruiting. The dietician I work with everyday simply acts as another "sales assistant" on the shop floor, but she seems happy with it. Another dietician friend I have at another store graduated in the UK and says she very much prefers it back there. I'm not saying that this is way it will always be, only that it takes time for attitudes to change and it is changing, only very slowly...