The problem with bookmarking overall is that it's very easy to click a button to save it for later, but very little of it ends up actually being read. It's basically a nice-to-have list, if there were infinite time and we had infinite energy. But we have neither, so we end up developing personal folder systems or installing extensions or utilizing SaaS, all in the hope that the links won't be dead by the time we can actually read them.

The lack of adoption for paid services (and lack of development for better in-browser functionality) is just our acceptance and recognition that the things we bookmark don't really matter. Any site that matters to you, you'll remember. Any site that you forget about but may need to bring up later, you can just as easily google for. And anything else is generally irrelevant or accepted as ephemeral, even if slightly stimulating.