The rest will be more informal as long as this responsibility to teach each other is taken seriously. I like commenting on them. I like talking with you about reporting and writing. I hate grading. I hate grading because grades mean so much to students.
Good grades mean graduation with honors, scholarships, career advancement.
Bad grades mean the opposite. One semester, a student told me I destroyed her confidence. She wasn't a bad writer, but no one had ever given her writing anything but praise. Criticism was too much for her. I am still sorry I hurt her self-esteem.