I find World of Warcraft to be a better reference that highlights the "problem" much better.

WoW combat system is faster, damage is much more randomized and much more frequent.

Therefore, the healing that comes to meet the damage must be able to respond in kind:
-Random damage means healers must do triage, making choices on the fly about who to heal with what tool in order to be efficient.
-Frequent damage means healers must stay on their toes, and seldom have the chance to do anything but heal. There is healing downtime in WoW, and so healers are able to throw dots, and deal damage inbetween aswell, but mostly they stay on healing. It also means MP is a much more precious resource.
-Faster damage means healing is a fight of attrition. You will rarely see a party stay at full health for long. Most of the time players stand at around 30seconds from death. Less if they don\\'t take care to not stand in the bad.

And despite all that, despite the fact that you can change your talents to DPS builds for questing without changing your class,
healing classes still have many more buttons for DPS.

Clearly, if you want healers to heal, increase the need to heal, rather than remove DPS abilities.