Which is fine as an approach - if every other healer also has an 8 second immobile channel or something similar on their raid CD. That's not the case, and that won't be the case, therefore, it absolutely is not fine. The change has to be looked at in terms of the overall state of healers, not in isolation of what you like about one spec. If Druids can no longer save the group during those mechanics where you want to use a raid CD while mobile, but stuff like HTT continues to be able to, you know what's going to happen? You will just not want to bring a Resto Druid to that content period. If you consider a fight like Blackhand, the spec is 100% trash without being able to get a Fox for Tranq, because there just wasn't a good place to be able to use Tranq pre-P3 without moving during the 8 seconds (and even in P3 it could be dicey).