It requires you to use frost spell, which means you have to take Frost Shock. Which you dont really have the points to, as you want Purge in RLP. Without seeing the sim, it also sounds like a DPS loss in general to use Frost Shock in your rotation
I’ve tried it and it doesn’t seem to be noticeable. You can spec into either and you shouldn’t really see a difference. I wish we had more choices/builds as ele