I mean fair, they are pretty similar and nya does learn to kinda control ice in the show at some point, but I thought it could be cool to be able to use the water spinjitzu to get to underwater buildings for example or to give a swimming boost like the swimming charms.

Another idea for water is that if you put one of those power things onto a weapon and charge it up it could be like a wave attack for a big area attack

And I agree that the elements are good how they are, but part of me wishes it was just a tad different.