We've seen Sylvanas use her banshee powers for multiple things, empowering allies, weakening enemies, killing people with her voice, flying, become incorporeal. doesn't this concept have as many potential applications as "become a demon" could the Dark Ranger be about being a "range-based elf to transform into an undead monster" with additional stuff like shadow infused thrown daggers and arrows, summoned chains and other mawsworn stuff (just speaking hypotheticals here).
Before Legion stuff like Demon transformation/meta was lore-wise a mostly Illidan thing yet in Legion it became the a class defining concept for the entire class and Illidan's unique powers were retconned into being something he could teach and others could learn to do en-masse, couldn't Dark Rangers become heavily centered around banshee and maw powers to give them more uniqueness?