Well not necessarily. Although not specifically Magitech, the concept of a healer that uses magic bullets to heal allies and other positive effects has been used in quite a few RPGs (see end) not just FF. It would take a little work to ensure it didn't overlap with other healers too much, but with some actions it's bound to happen regardless.
I would definitely enjoy having a healer that can do physical (elemental ranged) damage from a distance with imbuned bullets and also pop shots and AOEs on allies for plenty of the good stuff. Healing flamethrower anyone?
(Best example of top of my head was a character called Pepper Spray in Evolution on the Dreamcast. She had an attachment for her gun to give it healing/buffing effects)