No. I wish to be able to write correct high level English naturally and reading/writing correct English helps immensely, just as reading/writing informal English actually deteriorates one's ability to write the correct form.
Point still stands. Correcting other works doesn't help your sense of English(such as the case of Xant's doing). If you correct other works for your own advancement, it needs to be done on a regular, daily schedule like a job.
Correcting your own work, is INFINITELY superior to correcting other works precisely because of the fact that, as a race, we humans tend to learn from our own mistakes. Now, we might say this is wisdom, and many agree. Some of the older philosophers have said that wisdom is learning from others mistakes, though. So, perhaps it is good for you, perhaps it isn't. I personally find that for application of language, your mistakes are more important. In terms of building and mathematics learning from others is much better than learning from your own failures.
Also, concerning your Langauge thing. We tend to "pass over" things like that in general reading due to the fact that our brains are smarter than everything but...our dicks
