Citation Envoyé par Lokier Voir le message
The answer is probably in the realms of fanservice and SE being too lazy, lol...
Fanservice is the correct answer. The original design was deemed "not cute enough" so devs waifu'd the design. (jp source) (translation)

I wish they stuck closer to her concept art at least. Seeing her huge snake tail during her ult would have been neat :c