Legend of Korra Book 4: You aint bout Dat Toph

[Aldurin]

Originally Posted by Ryong

Now more than ever it seems like Korra has learnt how to bend the four elements, but doesn't know the techniques and motions for any of them.

It definitely showed in the Kuvira duel. Korra treats every element as a simplistic ranged attack while regular benders like Kuvira learn to make the most of their ability, being able to attack from all directions or make subtle changes to the fight that throw off such an aggressive approach. Korra's water bending is slightly better, likely from growing up as part of the Water Tribe, but she seems to treat every other element as the same kind of ranged attack or mobility enhancer.