Convinced more than ever that browsers should have auto-detected RSS feeds linked from pages and revealed "subscribe" buttons if the user configures a default RSS reader. Simple protocol, good UX opportunity for everyone, and would heal a lot of URL guessing.
@slightlyoff Opera had this, there was an RSS icon in the location bar for any page with feed metadata, and clicking on it added that feed to the built-in feed reader (which was just another mode of the built-in mail client).
@wollman Yes! I have a vague memory of that. ISTM that a good answer would be even more open; I.e., if you set a different feed reader as your browser or OS default, it would send subs to that instead.
@slightlyoff There would have to be a general mechanism for that, and in 2005 there wasn't. (I don't know if one has come into existence since then.)

@wollman You must be joking?

There was a general mechanism for that https://en.wikipedia.org/wiki/Feed_URI_scheme?wprov=sfti1# and it worked pretty well on some platforms that had something based on https://en.wikipedia.org/wiki/Internet_Config?wprov=sfti1#

@slightlyoff

feed URI scheme - Wikipedia