I’m not sure how many people still care about RSS, but for my blog I still wanted to have an RSS feed. (TBH: I don’t use RSS myself ¯\_(ツ)_/¯)

Luckily, Org mode includes the ox-rss contrib extension. Such extensions are bundled with Org mode, but are not loaded by default. You can use them without additional installation, but you have to (require) them explicitly.