third dimension can be cabin class and/or point of sale. For example. ex HK to AUS the "flex" and "essential" has same punitive cancellation charge and almost the same as "Light" for economy. ex JPN-SIN the "PEY" flex has cancellation charge whereas ex HK-SYD "PEY Flex" has no cancellation charge. when system are overly complex the incremental return of effective yield management diminishes. I get the idea behind market segmentation but my point is it's just onerously complicated in its current form.

The point about L or V subclasses coupled with R21, R31, R41 family on earning for partner programs are irrelevant, what I pasted was simply to say as example to if one was to put on QF there's some thoughts to be had before one assumes "flex" will be full points earning as they are with few other main airlines I fly with. Their approach makes me feel they simply made things overly complicated, done by morons people who thinks complexity is superior.