implications of adding root to a group

[Krims G]

Hello, I've been looking at the /etc/group and have noticed that some
groups have root included in them, for example "operator". Is it not
implied that root has access to all things and groups? What is the purpose
of adding root to a group? If I add root to some new arbitrary group, what
does it result in differently than if I do not add root to that group?

Answers & suggestions appreciated,

K