I think the desire to not playthrough FFXII again can simply be a result of the time investment required. I absolutely love the game, and would even like to start another playthrough, but with a number of other games on my plate as well as other things going on in my life I simply don't have the time to dedicate to a game that is longer than any other in the series, as well as the most challenging entry in years at some points. It's a game that demands more time and attention to get through than most other entries which can be flown through easily by simply spamming attack and using some rudimentary strategy when you run into a boss.

Ironically, the reason I think FFXII has more replay value than almost any other entry i the series (a challenging and compelling battle system) is part of what makes it hard to carve out the time to do it. That said, I have still been going back to an old save file occasionally and picking away at various hunts and other quests when the urge does strike and I have the time. Perhaps next summer when game releases inevitably taper off a bit I'll pick it up again for a full playthrough.