Something like that, if he end up putting those in, it would have save the grind to get back the items, levels, and stuff you did on your previous playthrough of the game since it can take a while to get back there each time.
It is up to him if he want to add that in, the story quests and recipes can reset back to normal so that it does not ruin the storyline for it, but everything else could stay the same when doing a New Game + playthrough
