Mail Enabled groups

[Sly]

Hi all.

I have a question about Mail-Enabled AD groups and managing the members of
through outlook. i vageuly remember managing Mail Enabled groups through
outlook to be bad practice, however i cannot find any supporting
documentation.

I have a manager who is currently asking for this feature, along with the
ability for other managers to update their own Mail-Enabled groups through
outlook, and i am unable to defend "why not to do this"

Why is this a bad practice, and where is the supporting documentation?

Thanks so much in Advance!
Sly