TL;DR - this is excellent for affording reason-able boundaries

This feature would make it much easier to maintain reason-able (an algorithm that can be resonably reasoned about) social/data boundaries.

Some of the takeaways from my experiment in maintaining an understandable boundary was that

1. You can't follow friends who follow alot of people

unless

1. You reduce your hops down to 1.

What you are proposing would allow one to have more granularity with which FoF you'd be willing to forgoe this for... e.g. if someone follows very few people and all the people you know that they follow are values-aligned, you'd be happy to take on faith data replicate. I might follow someone I trust who has hundreds of friends, but I don't want to replicate their hundreds of friends as it's less reasonable to assume there is a tight bond with all of those links...