I wouldn't clip if I didn't have to, our Jack hasn't been clipped since he retired. However I hate to see horses being made to work hard in a full coat. Sometimes see them out hunting absolutely dripping in sweat. It must be miserable for them, plus you run the risk of them getting a chill if you turn them out on a cold day with a damp coat. But I remember as a child the RS ponies were never clipped and had big woolly coats and they seemed to survive.