Ok, if the 'last boss' was very very very hard then people will have to spend more time leveling and such in order to beat the last boss. I would like that to happen but the problem is that not all people like us don't want to spend thier times on leveling for a longer time, that's why they made the last boss easier and added optional bosses (which are harder than the last boss) to FF games that are not necessairily needed to beat the game. Just my opinion :P