I feel that there isn't enough reliable ways for a necro support build(healer and tank) to generate corpses for their abilities. The most reliable way for a necro to get corpses is to use blast bones, but this is a damage ability which doesn't make sense to be using on a healer or tank. The other ways of generating corpses as far as the classes abilities go is having a summon die or be respawned(only after being recast 11+ seconds later for bone armor and 9+ seconds for spirit healer) so you have to wait a good duration for a corpse from those abilities or hope there are enemies that die nearby to use which some fights don't have.
My suggestion would be to add corpse generation to another ability. Some ideas I've come up with would be to have either the bone totem drop a corpse every 2 seconds for it's duration or have grave grasp generate a corpse for each of it's circles so that supports have a more reliable sorce of corpses than just slotting blast bones and waiting for timers to run out.
Also, I think corpses should have a longer time on the ground than 4 seconds(it could be longer or shorter but the point is they disappear so fast you don't have time to utilize them).
Let me know what you all think. I just enjoy the class and using class abilities rather than using all weapon abilities all the time for every build.