The problem is the number of abilities that many feel ARE mandatory in the shared role action list, basically limiting or outright removing any choice at all.
What do I consider mandatory for me as a healer?
Protect - Assuming it does in 4.0 what it does now, healers will be the only ones able to provide this buff.
Swiftcast - Assuming resses aren't made instant cast by default.
Lucid Dream - Assuming each healer isn't getting its own mp recovery tool (and why would they when the goal was to prune things)
Esuna - I consider the ability to cleanse debuffs essential.
That's four out of five picks I can't live without. And if Affection (the ability using the Divine Seal icon) turns out to be Divine Seal and that WHM has lost Divine Seal as a default skill, I'd be VERY hard pressed to choose any of the other choices over it. My role as a healer means that I need to be the best healer I can be and that means having all the tools I feel I need to perform that role.
Now you might say I am making a lot of assumptions here, but I say so are you. You're assuming we'll be getting replacements for all these skills moved into shared role skills or things will change so much that we won't "need" them, and I say that's a hell of an assumption. I can only go by what SE has shown so far. And what they have shown me is that 4 out of 5 of my shared role actions "choices" have already been made for me... 5 if Affection turns out to be Divine Seal, so no choices at all. I'll happily endure any embarrassment if it turns out I am being overly concerned for nothing, but right now I think I am justified with my concern.