It seems like people are looking for a change to the White Mage's playstyle rather than a buff to make it's current style more viable. The White Mage has always been a pure healer. Scholar always had more utility. And then Astrologian as well when 3.0 arrived. This makes me wonder why people insist on committing to White Mage if they prefer a more utility based healing style. Why not simply main AST rather than transform the WHM into an AST? I'd rather there be distinct styles within healing, rather than having SE streamline everything for an easy answer to balance issues.
In my opinion, the White Mage should be buffed in a way that properly compensates for it's lack of utility, not reworked into another utility healer. Whether or not SE accomplished this is yet to be seen. We don't have much information about the actual content of Stormblood calls for or it's healing and damage formulas.
As far as cross-role skill slots go, the only thing I used regularly on WHM was Swiftcast and Eye for an eye. The rest was just filler that wouldn't be missed. Using those slots to retain a few skills doesn't bother me, plus it's not just the WHM losing skills to cross-role. (Don't believe the hype.)
-AST loses it's mp refresh skill and it's divine seal counterpart (Synastry's 20% heal increase over 20 seconds is GONE).
-Stoneskin is removed from the game, but the other healers could cross-class it anyway. It was never a WHM exclusive.
-Stoneskin II was exclusive to WHM, but it can't be used in battle anyway. The only way to cast it regularly is to burn your Swiftcast between pulls. In 8 man raids and primal fights, the move is completely negligible.
-Esuna is the biggest loss in my opinion, but every healer had it and now has to spend a cross-role point into getting it back. It's a loss for everyone, not just WHM.
-Scholar doesn't really lose much, but they got a significant damage nerf, wherein Bane does less damage as it spreads, similar to Holy and Gravity.
To me, it looks like WHM was buffed, yet not reworked into a different kind of healer and people were expecting a different kind of White Mage.
-Assize has a potency of 300. It now does its full damage and full healing simultaneously. Combine this with the recast buffs from Secret of the Lillies I and II and your looking at an extremely strong healer for dealing with packs of mobs.
-Stone IV has a potency of 260. Fire IV has a potency of 280. That's an extremely strong standard attack ability for a healer. You don't even need Enochian to cast.
-Benediction recast time was decreased from 300 to 180. This along with Assize,
Tetragrammaton and Plenary Indulgence means that the White Mage has a lot of panic-button, instant cast healing. Two of them are aoe/multi-target instant cast heals.
-I think stacks of confession would be utilized mainly by bosses/mechanics that randomly or sequentially target individual teammates. In these fights, you'll have plenty reason to cast cure 1/2 on people other than the tank, thereby giving them stacks of confession.