So instead of actually discussing your ideas about healers on this forum about healers, you'd rather write a dissertation about how exaggeration is hard to understand (lmao) and how people in a totally unrelated thread on a different website almost sound like they sorta agree with you when answering a largely unrelated question. Good to know.
I agree with Dusty. Healers are magic users and straight up combos, even if they share a button, would just feel wrong. Plus if they shared a button it wouldn't do anything to address the issue. Procs or even just more interactions would probably be a better fit. Like Glare has a X% chance to increase the damage of your next Holy to 500 potency. Or every three casts of dosis grants a use of phlegma. Or every card you deal triples the potency of combust but reduces its duration. Stuff like that.
And though in principal i'm not against stricter healing requirements, it largely wouldn't work in 14. Not because healers in this game have Stockholm syndrome (whatever the hell that's supposed to mean on this topic), but because this game's netcode is so bad that reactive healing literally doesn't work. Plus that would quickly devolve into spamming medica instead of glare which isn't an improvement. And yes, it would be too hard for the sylphies and turbocasuals who would just ragequit. And the core of the issue isn't "i dont want to heal, lemme do damage" the issue at its core is "nothing in our kits is actually interactive so regardless of any increase in healing requirements we'd still be pressing buttons that just restore HP, restore HP over time, apply a shield, or increase defense". Plus the only thing the devs would realistically be creative with is how healers do damage because that wouldn't impact the skill floor of actually healing. Frankly i think that's a bigger problem than anything else. There's no ability that applies kardia to multiple people. There's no CD that averages out the HP of everyone in an area. There's no ability that duplicates your next healing ability on anyone with a certain buff. There's no ability that causes people to heal themselves when they attack an enemy you've debuffed. There's no heal that regens HP and jumps to someone else when they're topped off. There's no ability that buffs someone's defense and damages anyone who attacks them. The most creative healing skill in the game rn is probably macrocosmos but even that's on a 2 or 3 minute CD (plus its level 90) so you barely use it.