To me its not their size. To me the proportions.

The baby dragoons look terrible if you ride them as anything but a lala... but the mount music is soooo good. I legit only get mounts for their music

The new EW mounts just look sad based on head to body ratio... the art design team fucked up real time.

It does kinda feel like that sometimes they design a lot of "fun" items for only lalas. Then they just try to fit it for all but it does not always work...