Named outside the DZ have a 24hr respawn timer. So yeah they will not be as farmable.
I guess the stats on the DZ pieces are generally higher and that's where the complaint in, in min/maxing? If that's the only case really, then I don't mind so much because the only real reason to min/max in this game is for PvP which is all done in the DZ. The PvE stuff can definitely be done without being absolute BiS for everything.
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