Our tank healing is going to feel very sluggish if we have a 3sec cast time on Nourish. Ok with haste that will drop down, but intially at 85 we will have limited haste I am guessing. Assuming ofc we still have MT healers focusing primarily on the tanks and that tank deaths is a real problem with progression as it should be.
Ok so our healing will be the following
3x LB on tank at pull
Quick drink to get mana back
3sec cast on Nourish to keep up LB
LB lasts for between 7 and 9 seconds, so you need to cast Nourish every 4secs to keep up the stacks with a 3sec cast time. So approx 50% of the time we are going to be casting Nourish, assuming we want to maintain the stacks.
We are going to be staring at a 3sec castbar a lot when tank healing
Ok movement fights till mean that we have to manually refresh LB and make things a bit more dynamatic, but if you look at ICC, the vast majority of each fight, the tank healers are pretty much stationary.