It's required because when you run create-project, composer aims to create a completely clean brand new project from scratch. If you want to include some existing stuff into that project you'll need to move it in after the project has been created.
Edit: More info: https://github.com/composer/composer/issues/1135
Thank you for your answer!
I actually "fixed" my problem by just installing the app/framework manually.
But this is good to know.
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