What cores will change if they "clear" and "optimize" early msq quests? How it will affect you directly? You couldn't sniff Chocobo at your alt anymore? Or maybe finding kids at orange circles will ruin experience that you already had. Reworking old stuff is a good thing, but not completely erasing it, just optimizing for easier use. Upgrading old textures, adding new AA, teaching players about their rotation, adding voice lines to scenes without sound. Early start of game need some kind of rework, but not what cataclysm did, just some major improvements and QoL changes.