But does unfollowing them bring down afeather from our body or add to us?

To answer that @michaeljerry0 it doesn't

But what the advantage as well,

The advantage is that my feed would be clean and would be filled of things i'm interested in rather than things i"m not interested in, do you get my point?

I want to care about the people i'm following and make sure i always visit their posts and keep up with them but when you have too many inactive people you are following, you tend to miss out on the important ones on your feed.

I hope you get the message dear