Do CX still carry passengers connecting through HKG? I remember once in the past when weather in HK is terrible, they rerouted everyone transiting through HKG and give priority to those travelling to/from HK only.

This brings in a few benefits:
1) Since >50% of CX passengers now transit through HKG, it opens up a lot of space
2) Connecting passengers may arrive destination on time or even earlier
3) passengers are dealt with at the counter during check-in so as to reduce pressure on the hotlines

However this may have cost CX a lot extra to accommodate them on other airlines