Originally Posted by
Gurbz
The problem with 8-piece set bonuses is that it removes any choice in how you gear your character, at least if the set bonus is at all worth it. That's why they dropped them in the first place after T3. Blizzard wants MORE gear choice diversity, not less. So, even IF Blizzard brought them back, one of two things would happen. Either the set bonuses would be so weak that nobody will particularly care that they are there, or if the set bonuses are good the items themselves would have fairly terrible stats to make non-set gear a potential option even in the face of such a good bonus.
That is not even getting into the difficulty of acquiring that many set pieces in the first place, which many above me have brought up.