Earlier quoted context omitted.
The formality around making a discrete group of "Circles" was the problem. If they just let you have multiple feeds and you can add and remove people from those feeds it would have been fine. In those circumstances, the issue isn't you sitting there categorizing how close you are with each of your friends. You're just deciding who you want to share things with, it's not unlike a group chat you might have with a bunch…
This is a fantastic point! Over time, the number of group chats in FB Messenger has grown, and it totally meets this usage.
And it winds up being a better implementation of circles. The "circle" is object of interest. It's not a categorization that you put people in, it's an entity in its own right.