I disagree that you can do these things in HN. I guess you're thinking that one could curl down the text and then process it locally as much as one wishes, fee

I disagree that you can do these things in HN. I guess you're thinking that one could curl down the text and then process it locally as much as one wishes, feed it to some custom reader and consume it that way. Which you're right, is possible, but not exactly within HN at that point. And HN is the simplest use case. Tell me how I do any of the above things with messages people insist on sending via whatsapp or facebook or any such walled gardens that go out of their way to prevent interoperability? Give me SMTP and NNTP, open standards with infinite flexibility where I own and control the experience.