As the title says.

Energy Drain is perfect way to use up overflowing aetherstacks.
With the changes coming with 5.0 i will see 3 possible actions:
1) Aetherstacks are going to wast for unneeded healing just to dump/use them
2) Aetherstacks going to waste to keep Aetherflow on cooldown
3) Aetherflow sitting off cooldown because there are unused aetherstacks left

Option 1) and 2) are just painful to think about and even option 3) is way only feasable for casual players.
There is no way of optimizing your useage of aetherstacks because they can only be used for healing actions, even if no healing is required they can't be used for anything else.

So i wish back Energy Drain or a similar skill that is easyly spamable and not for healing for a way to optimize aetherstack usage.