Most of my engagement consists of a private Slack groups with groups of friends who enjoy discussing various topics. (And within these groups I tend to subscribe to only the channels that I find more interesting.) Similarly, on Instagram I have one account where I follow a group of close friends I've mostly had since high school, and another where I mostly follow a bunch of car related channels I like. Having that separation and ability to go and seek out a specific kind of content is fantastic. (As opposed to just being subjected to a fire hose "feed" of whatever an algorithm thinks will be engaging.)
Actually, I resisted RSS in the past for much the same reason. Even though you curate the feed, I vastly preferred having a bookmarks folder of blogs and other sites I followed, which I could then pick and choose from to suit my mood, than to have it all served up in a reader.
It would be nice to see things move more in this direction. For example, the default Facebook view, rather than a general news feed, could be a set of groups you belong to, along with ad-hoc groups of interconnected contacts, encouraging you to pick what genre of updates or conversations suits your current mood. Even then I don't know if it would be siloed enough to capture the same benefits, but it would be a step in the right direction I think.