My expectation of the healer role is that healer should only be required to heal. And by extension, the content should be such that it is feasible. From what you have said it is the same as yours. Please don't try to paint me having expectation that is not mine, when I'm explaining the reality of the situation healers are in now, not my expectation.
What I have said about materia selection is based on maths and as such, should be objectively the case of it, without opinions. I admit the math might be wrong in which case I welcome you to show me how the healers can, the whole situation considered, get as much benefit from their meld choise (or even more since the choise is supposed to be better) as their dmg or tank counterpart.