Honestly I think they need to streamline some heals in big ways. Free cure should not still be in the game. Cure 2 should be an upgrade to cure 1 and not an additional button. Cure 3 should have been renamed to something else for a GCD aoe heal and Cure 3 should have been a single target upgrade to cure 3.

If I were to redesign I would remove the redundant heals.

Each healer would have a minimum of

3 healing OGCDs
3 Damage dealing OGCDs
3 GCD damage abilites
1 Big Potency damage ability with a small heal potency attached and a 60s cooldown.

All of this would be granted by level 50 where anything additional would be either upgrades or additions.
Even if 1 is main spammable, 2 is your DOT. 3 is your every 30s GCD damage attack and 4 is your every 60s GCD. It would give you a solid baseline as opposed to what we have now.