Rss/Atom feels like a case of Querty keyboard. https://www.jsonfeed.org/ would be a better choice, but only a few readers implement it, and a lot of frameworks has Rss/Atom by default with a click.
As you explain in (4), Xml makes sense for complex data, but feeds are basically in their final version.
As you explain in (4), Xml makes sense for complex data, but feeds are basically in their final version.