So it seems to me that you don't see the purpose of using correction lines because the box that contains the cylinder will never be perfect or good enough?

The goal of drawing all of these boxed cylinders was never to draw good or perfect boxes and cylinders.

"This error checking method serves to help us work on gradually building a more intuitive sense for the proportion of these forms. Don't get stressed if you're constantly turning up mistakes - it's entirely normal, especially with so many different factors to control. The point is to gradually get better.

The truth of the matter is that for the most part, for any given drawing, you only need to be close enough. These correction methods go much farther than that, making every single error excruciatingly obvious. This in turn helps us learn from them a lot better, but don't think that you're going to be held to this standard in your actual drawings"

In the words of uncomfortable it's about building your sense of intuitive proportions.

If you ignore the extensions you may as well be drawing boxes and ignoring the cylinder. I could have reassigned the whole 100/150 boxed cylinders but I've looked at submissions that had a similar error to yours and were told to redo 50 of them.

By extending the incorrect similar line you get feedback that is crucial for improving on the next one. If you neglect the feedback there is no point in doing it.

Finally, I don't believe I repeat instructions all of it is written as if uncomfortable was the one critiquing.

If I was still unclear or if you have any more questions please let me know.