Scrolling through the lists on ZCA is painful. You can’t copy/paste the lists from ZCA and you can’t see the entire lists any other way.
Could compare lists to see who I am following, but who aren’t following me. You can’t see that in ZCA but you can see the opposite in the followers list. Easier to see who I might not want to see in my activity feed anymore.
I’m guessing it could be if someone isn’t following you anymore they get unfollowed as well.
I have to say I don’t really take notice of the following/followers function. I follow a few people and only a few people I know follow me, but my activities are by default set to private.