On the topic of Akainu's and Eye of the Twisting Nether (Wrist/Ring) and Hailstorm:
Sims are below to back up these claims, but the wrists are STILL TERRIBLE. Wearing 2 legendaries to support Hailstorm is a .5-1% gain over wearing one legendary and playing Ancestral Swiftness in every comparable build. This is consistently true across no tier and 4p tier builds. It doesn't take a genius to guess that either the legendary Necklace, Helmet, or Trinket bonuses will be valued at much, much larger than 1%. Ring + any of the other 3 legendaries listed will be a much better option. If the wrists and ring are the absolute only legendaries you have, then go ahead and play hailstorm ONLY IF YOU WANT TO, you are not required to go HS over AS.