[Threshold]

The campaign world is not the feature set. That is why AFS does not imply Dark Sun. It does accurately imply all the other features that are common to the less aptly named "RPI" type muds: permadeath, character approval, and all sorts of other features.

Why would people play (Insert Codebase here) muds other than the actual (Insert Codebase Creator) MUD?

For that matter, why do people play any MUD other than the MUD?

A classification based on historical relationship does not imply that the originator is the best.