I think this is particularly good point. In general, i would consider sentences in direct imperative mood as grossly inappropriate (for code reviews or anything

I think this is particularly good point. In general, i would consider sentences in direct imperative mood as grossly inappropriate (for code reviews or anything else), unless from someone in position of legitimate power / competence. It is interesting that they do not hesitate to use such disrespectful form in blogpost about respectful code reviews.