I don't expect ordinary elementary school students to be mature and competent enough to do this without devolving into bickering and status posturing.
In some schools teaching the skill of giving and receiving feedback without going into status fight will be a challenge for the teacher. On the other hand it's a skill that students should learn as early as possible.
Keep in mind the age of the students in question. Feedback from eight year olds on academic work is likely to be unhelpful even to other eight year olds.
You are right that eight year olds can't give each other the "correct" passphases to academic work in all cases. On the other hand that doesn't mean that the feedback isn't useful.
As far as spelling errors go, I see no reason why eight year old should be unable to find them. As far as style issues go, a eight year old has a much easier time to understand feedback from another eight year old than to understand feedback from an adult.
It's also not only about getting feedback but also about giving it. If you give feedback then you think about what you consider to be good and what you consider to be bad. That process is very important.
Verbal feedback is about more than giving someone a correct way to do things. It's about direction attention to an area over which the person might learn something.
As far as style issues go, a eight year old has a much easier time to understand feedback from another eight year old than to understand feedback from an adult.
"Don't write like that, it's stupid! You're a stupid if you write like that!"
As a teacher, I wonder if it is possible to instill this skill into students the skills of rationality and critical thinking. I teach the third grade, and it is not immediately apparent how to apply this with my own class.
The problems I foresee are as follows:
In the sequences, it is suggested teachers should drill into students words don't count, only anticipation-controllers. How practical is this for an elementary school level? Also appreciated would be any ideas or experiences on how to do this, or how to combat the above problems. Hearing from other teachers would be excellent especially.