I don't disagree with you. I too also want the web to continue to be interesting. I also find myself clicking on "Instance Articles" and "AMP" pages a lot, because the experience sometimes is just so much better.
You and I can probably live without Facebook, but for many, that's literally the only way they connect with friends online. And that's important, because the average user will become what defines the web. Just like trump is the president now, both are things I don't personally like, but that's just the people speaking.
In a way, we (hn users) are also uninteresting -- and the Facebook content are kind of interesting to other people as well. People are different, and we just have different objective functions. In that sense, HN itself is also a "silo". We don't want to be living in silos.