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"confusing variations in displayed XP values"...
as opposed to the perfect clarity that is displaying blatantly incorrect
And I suppose it never occurred to them to display +2500XP (50%) to let the player know that they had only earned 50% of the 'normal' XP for the activity.... Or to advertise in-game that certain activities currently had an XP bonus?
No, no, far better that players get burnt out on the grind (that they think they are earning reasonable XP from) and remain ignorant of the ways they could maximise their XP / Hour, driving them to the cash shop instead.
As for the improvements, I guess time will tell, but at this point it is very much 'wait for the D2:TTK edition'... assuming it ever happens.