How to Define and Use Everdo Areas Effectively- Everdo

Hello, everyone.
I am not sure I understand why the Areas in Everdo shouldn’t be the Areas of Responsibility / Focus in GTD.
Would it be possible to clarify? Is it because if they were the same concept, there is a risk that a user would end up having too many Area tags?

Areas must correspond to well-defined and independent environments, contexts

From what I read, some people are using the Everdo Areas to represent contexts, and this seems wrong to me, because it’s mixing up two different concepts.

Everdo provides a good way to filter down items based on the context on the left-side menu.
Therefore, one can set the context (“where am I?”) in the left hand-side bar and iterate through his multiple Areas of Responsibility through the global Area filter.
Like @Jordi, I have been using the Everdo Areas as Areas of Responsibility / Focus, covering all areas of my life, and it feels right.