My guess is the "Beastmaster"/Hunter class has been very neglected since FFVI. With Gau being by far the more unique character with all his abilities, yet you probably use like 3 or 4 in the game (the only true good ones) and in FFV having the Beastmaster job that you never used. Even FFT had some form of Monster Catching since you had skills called "Beastmaster" in the Squire tree.

That's my guess, Blizzard just found a new unique way to bring "Beastmaster" back into the game.