(sPvP POV) We had it in the past with FitG, stunbreak and 3 seconds stability on entering shroud. It was a strong grandmaster trait. Since then necros use two stunbreaks, wurm and spectral walk. Wurm is a nice stunbreak/port utility. Spectral walk is even better, can work as a double stunbreak and you return to your original point even if there is no valid path, pretty op. So, personally I don't think we need an extra stunbreak.