FF4DS overhauled the level up system and used Augments, adding several sidequests and making certain things that were useless in the original worth doing. The Mappingway sidequest encouraged and rewarded exploration. The game had a New Game + system, adding bosses that put even the FFIVA superbosses to shame.
How about that?
Perhaps I think it's a good enough game to deserve more exposure to an audience that may not have the chance to play it on any other system?