I'm not very fond of this 'cookiecutter.' everywhere. I'm aware this might be a controversial subject.
What is the rationale behind it ?

Here's a link to a branch https://github.com/0k/cookiecutter/tree/pr-remove-namespace (I can't propose it as PR as it's based on another PR #379 of mine).

This change is compatible with the existing namespaced templates.

If you want to look like a template made with this:

https://github.com/0k/cookiecutter-odoo