Make healers DPS with four or five healing actions

[ZenoDiogenes]

What do you propose healers do when they don't have anything to heal? Solo content/downtime/casual content etc.

Obviously, they need to keep the DPS spells to do solo content, but make them insignificant for DPS checks while raiding.
The game should put you in a position where you have to reactively or predictively decide how you apply your heal kit on every GCD or OGCD.

In essence, I would rather be busy healing my group back up as filler than throwing a bunch of glares at the boss.
It ruins the job fantasy for me.