You and Nalien have been kinda just talking past each other. Its entirely likely that the devs/designers used multiple sources to influence the new race. As with some of the races in Eorzea, sexual dimorphism does exist in the game world, and is a fairly common stylistic choice employed by the designers. Honestly, the difference between males and females in the race are the same as those in the Roe, just in height rather than girth. Even though FemRoes are really buff in comparison to the other female models, a male roe looks nearly 200-ish pounds heavier at a similar position on the height-slider. In this case they went went with a universally slender design, then put the male and female models at the opposite ends of the height-spectrum. That puts the females in the category of slender, and the males in the category of lanky.
Its not odd, or at least any odder than everything else in-game.
