The main issue with this is that SE homogenized some of the wrong things in both tanks and healers, though especially healers.

Everyone gets shields, mitigation, and regens.

While that can be fun and it's kinda fine for casuals, it's mostly only fine because casuals don't need to use most of that kit to get by. That's the entire point, but raiders get punished for that.

Despite SE's insistence of healers only heal, if you actually look at FFlogs, successful healers do half the damage of a full fledged DPS. It's only at the casual level that this isn't true, once you remove unsuccessful raid healers.

The entire design of healers had changed from ARR, where GCD heals were like 75% of healing, down to almost 0% now in ShB. Healers need to to stuff to not get bored, and if the boss mechanics don't force the healer to constantly do them since oGCD healing means that the healers essentially has 95%+ healer downtime, they're going to spend the whole time spamming a single button because SE didn't give healers anything else to do.

This isn't like the old Ultima/Everquest days where it was alright for a healer to go take a shower in between heal phases during a raid because they need to sit down and recover their MP before the next big heals. If the fight demands the healers' constant attention, they better have things to do the entire time.

To be honest, I don't know why healers don't get more utility skills in general. I mean, cards are great, and they take up a decent amount of the downtime ASTs get. It actually almost justifies having only two real damage buttons, as you can weave your cards in between. If only they had a noticeable effect and you did it more often. Like maybe you could draw a card every time you used Malefic, and when you got five, you could activate a buff on a target. The buff depends on the combination of cards, and you still got things like sleeve draw, shuffle, and other ways to manipulate the cards to change the buff.

At the same time SCH could get actually strategies that gave offensive buffs and mitigations. Put together three tactics from the aetherflow abilities to build a strategy, which gave the buff.

WHM could get...anything. They don't have a single utility skill for some reason, as if Afflatus Misery was supposed to make up for that. And if it was, then it's really telling how little SE is valuing the buffs that the other healers already have.

With how SE's been going on harder about the pure/shield healer divide since Sage was revealed, all the existing healers need a massive rework for those words not to be a flat out lie. It's not like the usual issues of going double shield healers is really that much of a problem in casual content anyways. Raiders should adjust their party comp so that they don't double up on anything in the first place.