You know, usually in circumstances like these, I blame the developers. But with SE and FF13, I think it has more to do with the DVD format and the fact that MS reserves ~1GB of each disc for itself. I mean FF games since 7 have been heavy on the CGI cutscenes. I would guess that given this is the first one for the HD systems, SE probably have gone all out on the CGI cutscenes. So all those, plus the game assets (which have to be repeated multiple times on the different discs) for a 50 hr game, probably take up a crap load of space. Sure they could have made the game look about equal, but that would have meant either taking out some cutscenes/story or putting it on 4-6 discs. I not 100% sure about this, but I have a suspicion MS may have "suggested" a 3 disc limit, as it would have made their version/console look more inferior coming on ~5 discs.
Having said all that, if the game still plays smoothly on the 360, I'm sure it will still be a fun experience.
