Due to the overall rarity of moogles (i'm gridanian so i understand they aren't rare in Gridania but others do not see them as much), I believe they are fuzzy, pure, cutesy, in this game to specifically contrast the gritty melodramatic nature of the war or at least pre war tension. When you think about it, there you are in the middle of the forest about to get attacked by a savage beast, and bam cute little moogle purity flies out and saves you. Its contrast. If everything was the same the game would get too boring fast.

The moogles in XII were a Namingway or _____ingway flashback from FFIV where they were just rabbits. While still technically moogles, they are more so a rabbit-way than a moogle.