It doesn't change the difficulty of the duels (Kaiba will still crush you if you don't play smart), and it doesn't change the fusion recipes. It simply removes the artificial time-wasting. You get to spend your time building decks and dueling , rather than resetting your console for three hours.
Unlike the retail version, where many powerful cards were "unobtainable" without cheating, this mod makes every card winnable through dueling. Yugioh Forbidden Memories 15 Card Drop Mod Download
If you are looking to speed up your playthrough or just want to experiment with powerful decks without the brutal RNG, the is the most popular quality-of-life change for the game. It doesn't change the difficulty of the duels