Why don't Hong Kong primary schools have more cooking classes?
Many schools lack kitchen facilities. However, cooking sessions for primary-age children, such as learning to make pizza, can be organised as a school excursion

Traditionally, cookery was considered a girls' subject. Thankfully, such sexist and meaningless divisions have been ditched. However, it is rarely included as a regular subject for study in primary schools.
At the secondary level, studying the science of food was often perceived as lacking rigour. But this is no longer the case. Food technology, as it is now called, is much more theoretical with a strong emphasis on scientific knowledge and practical skills.
There are a few possible reasons why your daughter's school doesn't attempt cookery on a frequent basis. Many schools lack kitchen facilities. Also, health and safety rules have become very tight and her school may lack the staff necessary to adequately supervise small groups of children. However, cooking sessions for primary-age children, such as learning to make pizza, can be organised as a school excursion and are run by several restaurants around Hong Kong.
Children generally love cooking as they can get their hands messy and taste the results at the end. The practical side of it certainly appeals to kinaesthetic learners as they can literally get stuck in. Cooking is also an excellent cross-curricula subject. It is particularly good for practising maths topics such as: ratios, fractions, measurement (capacity and weight), conversions, working out the cost of ingredients and more. Language skills of reading and following instructions are necessary to successfully follow a recipe. Other important personal skills developed by students include the ability to organise time and materials, and using their initiative and common sense.
Another strong argument for cookery to be in the primary curriculum is that children are far more likely to be interested in healthy eating and learning about the scientific effects of food on the body if they actively learn about different ingredients and how they are combined to make different foods.