100% this.
Shadow, gets (x) passives for shadow damage.
Blood, gets (x) passives for blood skill damage.
Bone, you guess it, gets (x) to bone skills.
Summoning damage, gets……Coalesced blood and curse related (x) passives, that every other damage type in the Necro kit also benefits from 
Hellbent Commander boosting summon is also nice but it’s not as much.
There are already enough aspects and items with (x) effects, we don’t really need more, maybe change ones like Reanimation etc into summon damage instead of minion damage.
So the solution is in the talent tree and rewording aspects likely.
Maybe combine minion and summon damage into one, leave the independent ones alone in talent tree.