Even Pro such as Federer, he hits most of his shot with his wrist cocked at the same angle. Only on some circumstances, he likes to add a little more juice to the shot, then he snaps(change the angle of his cocked wrist). However, it is so rare to see other tour player do this. That's why Federer is Federer. When he is fit, he can hit ALL kind of shots.
There are so many skills we have to improve BESIDES this. Just stays simple, we are just ordinary tennis lover, let's just stay healthy.
So, back to basics, yes, you should maintain your wrist cocked but pronation is allowed.