It sounds like a simple and effective means of making everyone not have to level jobs to insane levels.

As a Gladiator, instead of leveling up to 40something for Cure III, I have just "Cure" learned. Now I have the means to heal myself (in proportion to my level) without needing to level up CNJ to absurd heights that I otherwise wouldn't want to.

Or learning Defender at level 10 and using it with great effect without having to learn Defender II by leveling up MRD to 48.

Clearly I don't have the same amount of MND a CNJ would have, but the potency would be better without grinding a job I otherwise don't like playing.