The major tipping factor is really the Elite Void set. You can make a case for default Void needing to be nerfed, as it did provide really good boosts for level 42 armour, or even 60 armour for that matter due to great Defence value, lp boost and Damage increase. Even then, you could make a case it simply takes too long to obtain for it to be worth it. However, the Elite Void requires at least 78 att AND str, the completion of a Grandmaster Quest with one of the Hardest questing bosses, if not the hardest, and the same time invested in gathering the normal Void set to upgrade. Yet, despite all this, it has Armour/LP Values equal to Mithril, which to any person with enough levels to complete The Void Stares Back is simply way too fragile and not viable whatsoever in any kind of situation, specially with the reduced exp rates on weaker enemies (some of the places where Void was most usefull before EoC) and the (deserved) protection prayer nerf. So why would anyone even bother with Void now. People were discussing a while back how DKs would be dead content, which they never will until they introduce better rings, but thsould they not nerf Void, Pest Control will be the latest piece of Dead content in the game.