Barb Prime 2/3 bonuses still apply to every build, health when struck and health per hit.
Necro Prime 50% piercing and extra Bone Spear is useless for a summoner or poison, which are the most popular builds, the only benefit now is a chance to cast a pathetic venomous spirit when struck which is mostly irrelevant to a responsible Necro.
@Game I hope you can see the appeal of updating the Abyss Prime charm to be relevant for more Necro builds, as for the mechanics of Necro Prime benefits they are the least valuable of any abyss prime charm, since none of the mechanics help Summoner and only Venomous spirit helps Poison.