When I see the word rule, I just turn pale. Do whatever makes your heart sing. In my quilting world there are no rules - suggestions for what may be easier - what may happen if you fail to take a step - but no rules. When someone tries to impose there rules on you remember that the pioneer women who made quilts made them from necessity and they just did what they had to keep their families warm - No rules.
A local instructor had a fit when the student used burgundy thread for redwork on beige fabric. It was beautiful. I quilted it and it was just stunning. Another example of quilt police. I must be a rebel at heart!