I don’t know why this caught my eye, but I was instantly reminded of Clarity of Power’s “weaving” technique. CoP was their talent which was supposed to make a non-dot build viable for Shadow (remember it?). Then, theorycrafters figured out they could just use half of the talent and keep their dots and it was optimal.
Somehow I feel like anything like you’re suggesting here is going to find some odd hybrid thing that is optimal unless you actually replace Voidform when the talent is chosen. I wonder if the dev staff is still reelling from their failure of CoP providing two different playstyles in Shadow and they’re terrified to repeat it.
Or, they just don’t care about Shadow. That one is more likely.