Any chance of not losing abilities when doing low level dungeons?

[Ildur]

I'll bite, Moirear, and keep it short, because the following is quite universally true:

Healers only have only one or two buttons to heal their party in any of the pre-level 40 dungeons: Cure/Psychic and Esuna (if CNJ or WHM).

So your theorem about using only one skill == derp is invalid, because that's all they can do. DDing is not healing, so don't confuse your role. Sure, you can drop dots and stones or whatever, but that's not part of the healing mechanic.
And remember that Scholars don't get their area heal (which is lolworthy) much, much later than White Mages. So every dungeon is designed to be beateable with Cure/Psychic spam.
But things would be more fun if they had more skills, wouldn't it? They could spice things up a bit. Right now all they can do is "LOL Cure" and probably pretend to be a fake DD for a bit. BORING.