I believe the idea is to eliminate the need to level other classes in order to progress another. For healers this would be abilities like protect, cleric stance, and swiftcast (tho SC is a caster DPS ability). Spells like Physick is the ARC's version of cure, so I don't believe it pertains to abilities like those.

Basically, if it is role-specific rather than class-specific, then chances are the current class it belongs to is going to lose exclusivity to it.