Originally Posted by
Jaelommiss
This is blatantly false.
SMN maintains all ACN spells. SCH maintains one ACN spell, plus a few that share the same name but have different spell IDs. You can verify this yourself on the official job guides or Garland Tools. It might also be visible in game, but I'm away from my computer right now and can't check it.
While I agree that a single class branching into multiple jobs is probably a poor idea, it's not because the split jobs would necessarily have all of the base class's abilities.