I like the recent changes to some of the specializations in the upcoming balance patch.
Talking about Specializations here, not to be confused with Elite Specs.
Like the new effect called Death's Carapace in Death Magic Specialization, it adds a new mechanical effect to playing the Necromancer when using this specialization. This way this specialization can be balanced and tuned around this effect.
Now if each Specialization had its own unique passive effect mechanic like this, it can better be regulated and tuned and allow players to build up power or disperse power over time instead of being amped up from the start of combat to the end.
I believe each class and their specializations should have stuff like this.
Revenant Renegades already have something similar to this suggestion.