AllowUnfree doesn't work with Flake managed system

[tejing]

@NobbZ

But disabling parts of the module system without even telling the users of your template about this, does not fall under this credo.

Agreed. Dis-integrations like this need to be something the final user knows about and understands the consequences of. Otherwise they see documentation telling them a feature should work, it doesn’t, and they don’t even have any clue why, as happened here.