Space magic was a huge draw for many players when Destiny was revealed in 2013 and its hard to get excited for new releases without new powers to build around. The impact they have on the games sandbox is huge and I would say....scrap the damn Raids to make them happen. This is content the majority of players interact with more. Right now, its just weird seeing only 2 darkness subclasses. Hell, it doesn't even have to be a new damage type, since Resonance deals solar damage and nightmare stuff is Void based. Entering a new Saga without new subclass powers just doesn't feel good.