In short, teachers need to train themselves to set aside their red pens and examine ideas and see what students are trying to say instead of simply looking for grammatical errors.
If ESL/EFL writing teachers are really concerned with improving their student's grammatical competency, they should, in lieu of offering grammar correction feedback, constantly stress in their classes the importance of outside reading. Studies have shown that voluntary, 'light,' authentic reading (graphic novels, comics, the easy section of newspapers, popular literature) in the target language greatly helps the overall writing and grammatical skills of second language students.
Teaching writing can be a very taxing and time-consuming process. Minimizing grammatical error feedback has the advantage of greatly simplifying teachers jobs, giving them needed time to spend on concentrating on other important elements of the writing process, while also removing a significant impediment to their students learning how to effectively write.
This is really interesting! I like the things you post. :) I agree very much with this one.