I would ask: are there any notices about 3 tiers for each Priest spec? Look at T7 set bonuses. Very useful for Holy, but a bit useless for Discipline. Now T8 bonuses: the 2 pieces has a excellent bonus for each Holy and Disc, but T4 is totally useless by Holy (a PW:S costs too much to be casted and an Holy priest doesn't use it in his spell rotation). Why don't they simply make us 1 tier for Disc, 1 for Holy and 1 for Shadow? They are keeping saying us that Discipline healing is very different than Holy. True! But why don't we have 2 differents gears then?
I think a lot of people had talked about it, but I can't find another post... Have Blizzard ever answered at this question?