User blog comment:Rappy 4187/Technical Update: November 30, 2015/@comment-4347751-20151202204415

Changing Template Types should only be available to admins and bureaucrats, not sure that normal users are interested about what goes on 'behind the scenes'. Also wouldn't it be affective to, if a template is protected, that the type also be protected from editing? Not sure if this is already a feature.