RSS 2.0 is kinda an unspecified mess, and at least 15 year ago, if you wanted to be compatible with the majority of content you needed some weird heuristics to detect which interpretation of the spec a given feed was using (lol).

And Dave Winer was strongly against ever clarifying the spec, and that’s part of what led to Atom.

Not really, and it's still more error-prone than Atom.

There's really no good reason to use anything other than Atom.