Whm - Burst healer
Sch - defensive tactic healer
Ast - supportive healer

We need a healer that doesnt have any of what er already got.
I reallt think ee got enough healer unless SE got an suprise for us when they show the new healer class.

Mayby a healer with drain and osmos as offensive skill. With darkness... It could be a healer that dps at the same time.
Demi is known for taking a specific amount of % from monsters health but is very bad when the monster is about to die. But of that Demi is a aoe skill that would mean that taking health from monsters using demi will also heal the party members.
"But we got scholar as part of dps" - true but they got amezing defenive barrier stronger than ast and decent dps and can play both aaand has acces to solo heal aswell. Ast can both play the role but they lack longer range and burstier heals from whm. But they got this card system which is random and could turn tide of a battle. But since noct revamp they got access for better healing potency aswell

My point is we dont need more copys just a different healer that is totally different.