Why are some US STAR fixes/waypoints included in FAA's legacy files but not in FAA's published STAR procedures?
Revisions are made to improve traffic flow, adjust for infrastructure(eg local airport change in number of flights or nav beacon decommissioned), simplify procedures for pilots and ATC, or address some other routing conflict or safety issue.
This is why IFR charts and terminal procedures are only valid for two months.

For example there is a victor airway near here that had its MEA raised from 3000 to 5000 because it was discovered that at the lower altitudes something was causing the VOR signal to bend significantly and planes were getting dangerously close to a mountain, I think they may have even had a couple of crashes.