e.g. I've got an economist sub - a reputable source of news. Checked out the feed...picked one...week in review. Title on every post is week in review. Content of post is a link. No context, no summary, no single sentence...nothing.i.e. Would need to click through to find out topic on each one.
Might as well not use RSS...
Love the concept but have concluded in practice it is a non-starter. The usefulness of it depends entirely on what providers stick in the feed. And all their focus is on pushing their app/twitter/insta etc. Not hard to monetize RSS.