I 100% agree, however I really didn't like manually curating those circles ... I share a relatively diverse set of things/interests, so would have loved to leave it up to the other party which facet of my "feed" they could have subscribed to.
This isn't my use case, but a perfect example is people with kids. They're gonna share pictures and stuff of their kids, but as I'm sure you've seen, tons of people make comments like, "I wish I could just filter out pictures of babies and dogs!".