@inetdog
The fact that the Boeing batteries were unexpectedly being regularly discharged to a lower SOC than planned (because of ground operations error?) may be a critical factor in the reduced cell life.
Perhaps if an airline followed the rules/procedures for battery handling 'to the letter' repeated discharging to a lower SOC was inevitable? (In some areas this method of working is called 'working to rule'). I have lost count of the number of times when 'testing' a set of instructions that the author has said -"but nobody would do
that!"