What Healer kit (not encounter) change would make GCD heals NOT bad gameplay?

[Aravell]

Hard content (aka savage, ultimate)

• you barely don't have time to use gcd DPS. Aoe damage on the party is almost constant.
• Unexperimented players won't be able to clear this difficulty, which is the main idea of this difficulty.
• Experimented players will need to spam gcd heal rotation and use only ogcd DPS to contribute to damage, which is the actual role of a healer.

Would spamming GCD heals with OGCD damage spells be more engaging than spamming GCD damage spells with OGCD healing though? It sounds like the same thing, just reversed. I'd rather see kit diversification to make both GCD heals and GCD damage spells interplay with each other so you have a more or less equal time on both, encounter design would also need to change to necessitate GCD heals.