There's a lot to unpack with making that change to the other styles, let alone the fact it will also take some significant design and development work.
The main thing is not changing the core fundamentals of any existing Combat Skill without players having a strong say.
Necromancy gives us a huge opportunity to try a lot of ideas we have to evolve combat in the game within the confines of a single, new skill experience. We're not messing with anyone's existing playstyle in Melee/Mage/Ranged by doing that, which is important.
As Mod Ryan said - if they are well liked and perform well, some of these changes could very well happen to the other styles. But first it's about getting these new ideas in your hands via Necromancy, seeing what you all would love about the approach and going from there.