You are right, the current situation doesn't make anyone happy. But since most of the people starting with adoc Studio need a little help on how to start, we decided for the current approach.
In the perfect world we will have a template dialog with multiple options. And this is indeed our plan.
In the meantime, when I start a new project, I click once in the editor, press CMD-A and then Delete, to get rid of the content in the mini tutorial.