I think I'd probably have to agree, if you had to choose between the last boss being an experience over a challenge, you'd probably want it to be an experience. Though ideally you'd wan tit to feel like both. But at least Kefka feels like a memorable experience. Though for me VI was the first game I ever power-leveled with, and I had 6 or 7 characters at level 99 when i first beat it, so there really wasn't any chance of losing, regardless