The way I see it, there are two kinds of parents: Parents who give a crap, and therefore do whatever they can to make sure their kids are doing what they should, and parents who don't.
Parents who don't give a crap aren't going to suddenly change, because they spent half an hour in a school desk. Parents who do, are ALREADY telling their kids to work hard, have a good breakfast, get plenty of sleep, and do their homework on time. They are, if need be, ALREADY tearing their hair out and threatening the child in question with a lifetime of bitter regret, if they do not push themselves in every class, every day, even if it is not fun.
So, what's the point? Have teachers ever actually met with a parent, to have the parent say, "I had no idea I was supposed to encourage my child to attend class. What a great idea!" and then had the student's grades improve? Or is this just a system that we are all stuck with, that everyone knows doesn't actually make a difference?
Fortunately, I have found a teacher who is willing to conference by email. I can get the information I need, she can get the information she needs, and neither one of us has to move mountains to make time for it. Plus, I have a written record of it all. Which, as I have said more than once, is absolutely crucial in dealing with any large organization that has your kids by the scruff of the neck.