Does not add depth. Effectively makes you choose “sides”. Unlocking special affixes by collecting these “power” stats seems awfully similar to a set bonus. I don’t feel compelled by this system to incentivize creativity and freedom in creating your own build.
Please DO NOT add power affixes.
I suggest adding elemental affixes instead, that doesn’t force any particular “unlock” based on some generic value threshold, but rather a direct effect to your elemental damage type that are built-in to all skills, in a way that doesn’t restrict you to one type of elemental type in any way.