https://datatracker.ietf.org/doc/html/rfc4287
https://datatracker.ietf.org/doc/html/rfc5023
These specs and the discussion about them at the time really are from a different era of the web. The Syndication Protocol fully embraced REST which was also white hot then. There was a real feeling that with a good format and a standardized way to consume and interact with the resources, it would allow for easier sharing of not just blog posts but other data as well.
The Brocken is the highest peak in the Harz mountains of Germany and is where witches are said to gather on Walpurgis Night. So it was quite a subtle dig.