While it does clarify a lot, the Appendix has a lot of actual mechanics in it which don’t really qualify as clarifications in my opinion, such as several prohibitions unique to the Appendix - it doesn’t clarify some other existing prohibition elsewhere, its the Appendix itself which declares them.

Also, this has the advantage of cutting down a few words from the ever-increasing wordcount of the non-Dynastic rules.

It’s not a bug/exploitable scam though (but even if it was, refer to Fair Play Rule #10), because the Appendix has priority over the Core Rules, so even if the Core Rules says that it’s only purpose is X, the Appendix can just ignore it and do otherwise. But it keeps things tidier.