Before we learn to speak we should get proficiency in grammar of any language. What do you think?
In my oppinion, there is only one way to learn a language, speaking it and trying to use your knowledge in a real conversation.. and that´s quite hard! no profeciency title is going to help you there if you never spoke this language before xD
And also,not everyone is able to be a master in grammar but they can speak easily a language!
Children do not learn this way. I think many adults learn poor pronunciation and speak haltingly because adult language courses focus on grammar and writing.