Adding a specialization is a good thing. Key word here is adding. Good thing Yoshi had already confirmed in the past that players will be able to select one craft to pursue mastery in. So as far as DoH goes in the future, relating to specializations and or mastery, players will already be limited to mastering one crafted class while they can simply cap the others.

Even in ARR we know each DoH is becoming more independent with less cross classing skills and less dependence on levelling multiple crafts to be good at one.