Then just style it, not cut it. Heck, maybe the Inklings and Octolings can morph them into any shape they want. That's not really an excuse to NOT eventually add in hairstyles in the future, anyway. Also, why are you confused as to why there are people like us who want and prefer pants over shorts? It's just a non-controversial opinion, such as preferring red over blue, pizza over hot dogs, Pepsi over Coca-Cola, etc. Some of us don't want to show out legs.
Nintendo EAD's ideology on character design? Uhh... I don't know what you mean by "Nintendo EAD", and I'm unaware of their ideology. Can you explain?