This site is not a genealogical source in-and-of itself. Rather, it is a repository of information, references to sources, and digitized source documents that facilitate the exploration of our common family history. Keeping sources and/or references tied to this "meta data" is important part of the documentation process and extremely valuable in family history research.
Tracking ancestry via DNA is subject to your supposed history and the documentation of those with whom you compare DNA. Therefore, correctly researched and documented ancestry is still of supreme importance.