Add one more to the cacophony: I learned the hard way connecting KA-AA International-to-International in PVG is like connecting in a third-world country like the U.S.A.
However there was the added benefit that Cx/KA wouldn't even tag the bag trough or issue connecting boarding passes so you have one more line (check-in). Unneeded stress as we almost lost our connecting flight due to the bureaucracy,
Hopefully China is not like Washington and they'll fix the situation. Washington is busy to ensure that passengers that board at AUH don't get to preclear US customs and immigration there (so that they can avoid the mess that getting into the US is).