You’re missing two big ones: 1. RSS readership can’t be effectively tracked, and regular readers may transition to RSS, so RSS content becomes a black hole of

You’re missing two big ones: 1. RSS readership can’t be effectively tracked, and regular readers may transition to RSS, so RSS content becomes a black hole of readership. 2. RSS can’t easily be monetized via ads or a paywall (although some sites have managed it, like Ars Technica). It sucks, but most sites have to make money somehow, and RSS just isn’t very conducive to that.