english writing must be learnt in colledge english courses.
coz it is very important in the practical application, such as writing a letter to friend or clients, writing a speech, accomplish a paper, etc..
furthermore, writing is the mix demonstration of listening and reading, and it is helpful for speaking. only one could listen enough and read enough, could he have a nice perfromance in writing. then only with the success with listen, read and writing, could one make fluent communication with others, like speaking.