The more general audience is too busy playing the game to take the time to read all that.
Healer is always going to be a hard role to design because what a healer will be doing is dependent on the skill level of the entire party (including the healer).
Are you a good (or better) healer in a good (or better) party? Expect to spend most of your time dealing damage because your party is not taking avoidable damage.
Are you a bad healer in a bad party? Expect to spend all your time healing and praying you don't run out of mana because they're taking so much damage and you have a hard time deciding where to prioritize your healing so you're probably just spamming your AoE heals.
Are you and your party somewhere in between? Hard to say what might happen.
Damage dealing in this game (at least for the other roles) is generally based on combo priorities. You build through a combo (or set of combos), unleash a finisher then start over. Fail to execute the combo correctly and your potency is significantly reduced.
YoshiP has said in the past that they don't want healers to be placed in the position of having to choose between keeping up a damage combo for the damage output or healing a party member. They want the core function of the role - healing - to be the priority at all times. Thus damage dealing in the healing role is simplified. We can interrupt damage to heal then immediately go back to damage without a loss of damage potency.
That means the good healers in the good parties are likely to end up bored because most of their time is spent using the simplified damage abilities. That's unavoidable in Normal content, which has to be designed with less skilled players in mind.
What about design for Savage and Ultimate? That's a question best left to those participating in Savage and Ultimate, not the general player base.
I can't raid at that level anymore myself but I would say to SE you don't need to make things easy on healers in Savage. Challenge their healing abilities instead of their ability to weave the occasional oGCD heal in between damage spam. If they were busy healing, they wouldn't be worried about having only 3-4 buttons for DPS.