Default group - any special purpose

Dadabik ships with two groups, admin and default.
I have created a "public" group with a public_user, and an "editor" group.
"admin" obviously makes magic things happen for its users :)-D
Does the "default" group serve any essential purpose if you don't have any users assigned to it?
Does it have any magic behaviour or limits?
I now realise, of course, that now I have a public user all my "editors" could be "default".
 
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