As a general comment, the brief reasoning to be potentially included in the template is not to be a replacement of the explanation that usually follows a Last Warning. Even if the reasoning is listed on the template, users should aim to be more detailed on the offenses that led to the LW.
Yet all the other warning templates follow the exact same rule that you should probably give a more in-depth reason accompanying it. I don't see why Last Warning should be an exception to it.