Hardcores NEED something to do.
And God forbid they're actually allowed to feel pride in the accomplishments that took so much work to achieve.
Animation lag is certainly an issue, but for now it's something everyone has to deal with, cores included. It's good that Ifrit's incredibly hard, he's an ancient god, and core's are bored with all this easy stuff any old Joe can do they want something worth the card work and dedication that goes into hardcore playing. This includes the high risk of materia and the task of finding equipment useful for the battle. Certain classes will always be better suited for certain situations, that's why we can change classes whenever we want, they don't have to be so balanced that they can all do the same basic task of defeating all foes with equal probability.
The only real issue that needs fixing is the animation lag, because it actually disrupts the way the game is supposed to be played intentionally. And all that aside, from what I hear, the Hyper Ifrit battle isn't even that hard. (I haven't gotten to it myself though so I can only speak from second hand experience.)