I think all of us will make comments on questions suggesting improvements - be it in the form of "Add a schematic" or whatever.
Sometimes this list becomes long after a while as people make small suggestions to clarify the situation - "Add this spec", "Did you do this", etc. As a result you get a wall of comments below a question. I have noticed myself doing this more than once and I think it does not make for structured reading, and once the OP actually implements this or adds the requested information to the question, it does not serve any use. Is it good practice to remove these comments once this happens?