HKG SA-METAR/TAF
Couple of issues here.
1. HKG Observatory is the service provider. Typical HKG Government working practices apply, with "job for life" and "don't stick your neck out" attitudes.
2. They are only reporting for a very small area. It is either a 3 or 5 km radius (I can't remember.... anyone with better info please post with your source). So during the summer it can be obvious to everyone that there will be a massive CB on a 5-10nm final for 25 during the afternoon. However, the Observatory have no remit to include that in their forecast.
3. There are now so many additional sources of weather at our finger-tips. Look at radar pictures etc!