Level up enough in the same job and you can then start to mix and match abilities across class types, allowing for an impressive amount of character customisation. Other inspirations come, not from Final Fantasy but mobile games, including a controversial use of microtransactions that allows you to buy the ability to freeze monsters during battle. Although you can save up to do the same thing if you keep the 3DS in sleep mode for a set length of time.
It seems a thoroughly unnecessary addition though, since there are innumerable other ways the game could’ve found to make itself easier for newcomers. Also odd is a mini-game where you’re rebuilding the main character’s lost village, which happens in real time or, again, while the game is paused.