You must not use bow users much if you think an AoE charge shot isn't very unique.

Fischl and Diona are the 2 characters I use the most. No need to assume things.

Except Oz is literally both of Fischl's abilities and she does nothing outside of him. Ganyu also has a taunt and that large cryo field. In terms of just kit setup, I think she's distinct enough from 4s to warrant being a 5.

I guess is a very subjective matter because I still think Oz is more original with a lot of different uses and we are talking about a 4 star. When you compare Ganyu kit to Childe, the last 5 star bow, it feels not enough to being the bigger source of income of the game for 3 weeks. But that's to me.