Oh, I love this article!
I have an old English friend who use to say that they have the "proper system" because they count in dozens instead of decimals... haha
But apart from this, I am working with groups most of the time and my favorite group setting is having 12 people in a team, for the very same reasons that you described with your pizza example... It is just easier to form small groups or pairs, it works many ways perfectly.
Great article, very educational! :-)
Congrats!