Hyrule Warriors didn't have any character with a moveset clone. I think it was also the case for DW8 (need to check), and this game has a lot of characters, much more than Fire Emblem Warriors.
So, this argument doesn't seem to hold water.
Every playable character in Dynasty Warriors 7 and Dynasty Warriors 8 had cloned movesets.
Anyways, I'm just glad that we can indeed play as her. She looks great, and the trailer was just fun. Can't wait to unlock her myself.