Well making a full and detailed town does take a long time..
If you're one person making it... And it's fully accessable :p..
If I recall correctly towns in FFX were pretty small so... I don't think it counts. However, if they did it because it didn't fit in the game then that's fine.
I think they're just making excuses to all the people complaining over the differences between ffxiii and previous games.
Regardless.. They don't seem very confident in their game.. When they keep making excuses. Just wait for people to play the game and make up their own mind. These things don't really help.