so if you're DB-s your arter, go play rifts, where you kill elites as quickly as possible (normal?)
what i feel that is not balanced is overall reward where standard (say T1) playthrough is actally the least effective of it all.
if you need mats: just roll normal rifts
if you need legs: roll on normal in areas, where theres as much chests and flippable bodies as possible
if you need EXP: roll certain areas/quests at high difficulties.
And the worst of all: you still be quicker (say total 50DB-s, 5 legs, 1B EXP together) with making 3 different games for each purpose than one average game.