throw a dyce
I am having trouble following your post but I think when you say
"..why (10 HK$) don't they carry more as this is a common problem,.."
you are saying crews are chosing, for economic reasons, to not load enough fuel.
Often out of LAX/ SFO you are operating to a fuel limit; either the amount you can fit in the tanks, or Max Ramp Wt, Structual TO Wt or RTOW; You simply cannot load anymore fuel.
Your options are to offload passengers or freight at the last minute; which will mean you delay miss your slot and then APU burn more fuel (and of course alienate a lot of customers). You can launch and land in TPE or ZBAA or Soeul and at best cop a long day and at worst nitestop because CX can't generate a crew to take the aircraft on. Alternatively, you launch then manage the aircraft and fuel and prior to passing your LPD you will have numbers to be legal and sensible; however as a prudent pilot you are considering the "what ifs" so you want to get as many things on your side; which would include getting CX ops to ask Suzie Wong and her colleagues that you have priority over other CX aircraft... is that unreasonable?
It would be erronous to think crews are launching knowing that they have insufficient fuel and expect HK ATC to bail them out at the other end. Equally, it kind of stupid to fly 15 1/4 hours from LAX managing the fuel as best you can and then follow a bunch of company aircraft arriving from MNL and TPE around the radar pattern and then get too close to them on finals, or a windshear warning and goround and declare an emergency due fuel. Don't you think as a company we can avoid this by sensibly shuffling the priority of our own arriving aircraft?