CX/KA coshares definitely needs improvement.
Although I have never experienced any problems personally, I have seen lots of passengers complaining.
One of the most common arguments was a family of 3 or 4 with children were traveling from a Mainland city to TPE via HKG. For some unknown reason, they were seated separately on the flight from HKG to TPE. KA ground staff was helpless while being yelled by the passenger before boarding.
I recall witnessing this more than 3-4 times while boardng on a KA flight.