I don't know why so many people have got in a twist about the 'cartoon aeroplane'. I read the Pilot article on sideslipping, and although a little cautious in its approach to the subject, I thought the cartoon drawings explained clearly and well the control surface deflections for each of the described techniques.
I remember thinking as I read it that this way of illustrating helped the reader visualise how to fly this useful approach technique. Well done for being innovative!