More information is included in the booklet.
You may think your wishes are similar to those of other people and that your loved ones and doctors will automatically know what you want when you are very ill. That's not true. In reality, everyone has different wishes and yours won't be followed unless you make them clear. For example, your dying process could be artificially prolonged even though you may have wanted a natural death. Not expressing you wishes can put your family, friends and doctor in the difficult position of guessing what kind of treatment you want, which would lead to disagreements.